1.14.1

- Implement non-linear threshold slider (histogram percentile method)
- Add real-time solvability calculation with progress indicator
- Improve solvability logic with generative lookahead (smash)
- Update ImageImportModal UI (alpha preview, grid size 5-80)
- Add missing translations and difficulty labels
- Optimize web worker pool with queue clearing and progress reporting
- Fix mobile camera support and UI layout

.gitea/workflows/deploy.yaml

@@ -0,0 +1,23 @@
+name: Deploy to Production
+run-name: Deploy to Production by @${{ github.actor }}
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: self-hosted
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+
+      - name: Build and deploy with Docker Compose
+        run: |
+          # Próba zatrzymania i usunięcia starego kontenera (ignoruje błąd jeśli nie istnieje)
+          docker compose down --remove-orphans || true
+          docker rm -f nonograms-app || true
+          
+          # Start nowej wersji
+          docker compose up -d --build

.gitignore

@@ -1,7 +1,3 @@
+.gpg/
 node_modules
-dist
 .DS_Store
-.vscode
-.idea
-*.log
-dev-dist

LICENSE

@@ -0,0 +1,23 @@
+MIT License
+
+Copyright (c) 2026 gkucmierz
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+See README.md for project description.

README.md

@@ -1,3 +1,13 @@
 # Nonograms
 
-Link do aplikacji: https://nonograms.7u.pl
+## Description
+
+Nonograms is a modern, fast, and accessible logic puzzle game (also known as Picross or Griddlers). Solve pixel-art puzzles by marking cells according to numeric clues for rows and columns. The app features:
+- Clean UX with keyboard and touch support
+- Multiple languages and PWA support (installable on desktop and mobile)
+- Difficulty simulation and guide to learn solving strategies
+- Shareable puzzles and persistent progress
+
+![Nonograms Application Screenshot](public/screenshot.png)
+
+Play online at https://nonograms.7u.pl or install as a PWA for an app-like experience.

check_i18n.cjs

@@ -1,20 +1,13 @@
-
 const fs = require('fs');
 
 const fileContent = fs.readFileSync('src/composables/useI18n.js', 'utf8');
 
-// Extract the messages object
 const match = fileContent.match(/const messages = ({[\s\S]*?});/);
 if (!match) {
   console.error('Could not find messages object');
   process.exit(1);
 }
 
-// We need to make the string valid JS to eval it.
-// It seems the content inside `const messages = { ... };` is valid JS object notation.
-// But we need to be careful about imports or other things if we were to `eval` the whole file.
-// We'll just `eval` the object part.
-
 const messagesStr = match[1];
 const messages = eval(`(${messagesStr})`);
 
@@ -25,10 +18,8 @@ const missing = {};
 
 languages.forEach(lang => {
   if (lang === 'en') return;
-  
   const langKeys = Object.keys(messages[lang]);
   const missingKeys = enKeys.filter(k => !langKeys.includes(k));
-  
   if (missingKeys.length > 0) {
     missing[lang] = missingKeys;
   }

dev-dist/sw.js

@@ -0,0 +1,92 @@
+/**
+ * Copyright 2018 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// If the loader is already loaded, just stop.
+if (!self.define) {
+  let registry = {};
+
+  // Used for `eval` and `importScripts` where we can't get script URL by other means.
+  // In both cases, it's safe to use a global var because those functions are synchronous.
+  let nextDefineUri;
+
+  const singleRequire = (uri, parentUri) => {
+    uri = new URL(uri + ".js", parentUri).href;
+    return registry[uri] || (
+      
+        new Promise(resolve => {
+          if ("document" in self) {
+            const script = document.createElement("script");
+            script.src = uri;
+            script.onload = resolve;
+            document.head.appendChild(script);
+          } else {
+            nextDefineUri = uri;
+            importScripts(uri);
+            resolve();
+          }
+        })
+      
+      .then(() => {
+        let promise = registry[uri];
+        if (!promise) {
+          throw new Error(`Module ${uri} didn’t register its module`);
+        }
+        return promise;
+      })
+    );
+  };
+
+  self.define = (depsNames, factory) => {
+    const uri = nextDefineUri || ("document" in self ? document.currentScript.src : "") || location.href;
+    if (registry[uri]) {
+      // Module is already loading or loaded.
+      return;
+    }
+    let exports = {};
+    const require = depUri => singleRequire(depUri, uri);
+    const specialDeps = {
+      module: { uri },
+      exports,
+      require
+    };
+    registry[uri] = Promise.all(depsNames.map(
+      depName => specialDeps[depName] || require(depName)
+    )).then(deps => {
+      factory(...deps);
+      return exports;
+    });
+  };
+}
+define(['./workbox-7a5e81cd'], (function (workbox) { 'use strict';
+
+  self.addEventListener('message', event => {
+    if (event.data && event.data.type === 'SKIP_WAITING') {
+      self.skipWaiting();
+    }
+  });
+
+  /**
+   * The precacheAndRoute() method efficiently caches and responds to
+   * requests for URLs in the manifest.
+   * See https://goo.gl/S9QRab
+   */
+  workbox.precacheAndRoute([{
+    "url": "index.html",
+    "revision": "0.kkc80cp3p5o"
+  }], {});
+  workbox.cleanupOutdatedCaches();
+  workbox.registerRoute(new workbox.NavigationRoute(workbox.createHandlerBoundToURL("index.html"), {
+    allowlist: [/^\/$/]
+  }));
+
+}));

difficulty_simulation_results.json

@@ -1,938 +0,0 @@
-[
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-  },
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-    "size": 80,
-    "density": 0.7,
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-    "minSolved": 99.9375,
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-  },
-  {
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-    "density": 0.8,
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-    "minSolved": 100,
-    "maxSolved": 100,
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-  },
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-  }
-]

docker-compose.yml

@@ -10,5 +10,5 @@ services:
       - "8081:80"
     restart: unless-stopped
     # Uncomment the following lines if you want to mount the configuration locally for development/testing
-    volumes:
+    # volumes:
-      - ./nginx.conf:/etc/nginx/conf.d/default.conf:ro
+    #   - ./nginx.conf:/etc/nginx/conf.d/default.conf:ro

index.html

@@ -3,7 +3,7 @@
   <head>
     <meta charset="UTF-8" />
     <link rel="icon" type="image/svg+xml" href="/nonograms.svg" />
-    <link rel="apple-touch-icon" href="/nonograms.svg" />
+    <link rel="apple-touch-icon" href="/apple-touch-icon.png" />
     <link rel="mask-icon" href="/nonograms.svg" color="#00f2fe" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Nonograms Pro - Vue 3 SOLID</title>

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "vue-nonograms-solid",
-  "version": "1.9.10",
+  "version": "1.14.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "vue-nonograms-solid",
-      "version": "1.9.10",
+      "version": "1.14.1",
       "dependencies": {
         "fireworks-js": "^2.10.8",
         "flag-icons": "^7.5.0",

package.json

@@ -1,9 +1,10 @@
 {
   "name": "vue-nonograms-solid",
-  "version": "1.9.10",
+  "version": "1.14.1",
+  "homepage": "https://nonograms.7u.pl/",
   "type": "module",
   "scripts": {
-    "dev": "vite",
+    "dev": "vite --host",
     "build": "vite build",
     "preview": "vite preview",
     "test": "vitest"

public/nonograms.svg

@@ -1,28 +1,44 @@
 <svg xmlns="http://www.w3.org/2000/svg" width="192" height="192" viewBox="0 0 192 192">
-  <rect width="192" height="192" fill="#0b0f1f"/>
+  <defs>
-  <g transform="translate(24,24)">
+    <linearGradient id="bg" x1="0" y1="0" x2="1" y2="1">
-    <rect x="0" y="0" width="144" height="144" rx="16" fill="#121639" stroke="#00f2fe" stroke-width="4"/>
+      <stop offset="0" stop-color="#43C6AC"/>
-    <g stroke="#00f2fe" stroke-width="2">
+      <stop offset="1" stop-color="#191654"/>
-      <line x1="24" y1="0" x2="24" y2="144"/>
+    </linearGradient>
-      <line x1="48" y1="0" x2="48" y2="144"/>
+    <linearGradient id="cell" x1="0" y1="0" x2="1" y2="1">
-      <line x1="72" y1="0" x2="72" y2="144"/>
+      <stop offset="0" stop-color="#00f2fe"/>
-      <line x1="96" y1="0" x2="96" y2="144"/>
+      <stop offset="1" stop-color="#4facfe"/>
-      <line x1="120" y1="0" x2="120" y2="144"/>
+    </linearGradient>
-      <line x1="0" y1="24" x2="144" y2="24"/>
+    <filter id="glow" x="-20%" y="-20%" width="140%" height="140%">
-      <line x1="0" y1="48" x2="144" y2="48"/>
+      <feGaussianBlur stdDeviation="1.5" result="blur"/>
-      <line x1="0" y1="72" x2="144" y2="72"/>
+      <feComposite in="SourceGraphic" in2="blur" operator="over"/>
-      <line x1="0" y1="96" x2="144" y2="96"/>
+    </filter>
-      <line x1="0" y1="120" x2="144" y2="120"/>
+  </defs>
-    </g>
+  
-    <g fill="#00f2fe">
+  <!-- Main Background -->
-      <rect x="6" y="6" width="18" height="18" rx="3"/>
+  <rect width="192" height="192" rx="42" fill="url(#bg)"/>
-      <rect x="54" y="30" width="18" height="18" rx="3"/>
+  
-      <rect x="102" y="78" width="18" height="18" rx="3"/>
+  <!-- Console Screen Background -->
-      <rect x="30" y="126" width="18" height="18" rx="3"/>
+  <rect x="26" y="26" width="140" height="140" rx="16" fill="rgba(0,10,30,0.5)" stroke="rgba(0,242,254,0.2)" stroke-width="1.5"/>
-    </g>
+
-    <g fill="#ffffff">
+  <!-- Letter N built from Nonogram cells -->
-      <path d="M36 40 h16 v64 h-16 z"/>
+  <g fill="url(#cell)" filter="url(#glow)">
-      <path d="M52 40 h16 l32 48 v-48 h16 v64 h-16 l-32 -48 v48 h-16 z"/>
+    <!-- Left Column -->
-    </g>
+    <rect x="38" y="38" width="20" height="20" rx="4"/>
+    <rect x="38" y="62" width="20" height="20" rx="4"/>
+    <rect x="38" y="86" width="20" height="20" rx="4"/>
+    <rect x="38" y="110" width="20" height="20" rx="4"/>
+    <rect x="38" y="134" width="20" height="20" rx="4"/>
+    
+    <!-- Diagonal -->
+    <rect x="62" y="62" width="20" height="20" rx="4"/>
+    <rect x="86" y="86" width="20" height="20" rx="4"/>
+    <rect x="110" y="110" width="20" height="20" rx="4"/>
+    
+    <!-- Right Column -->
+    <rect x="134" y="38" width="20" height="20" rx="4"/>
+    <rect x="134" y="62" width="20" height="20" rx="4"/>
+    <rect x="134" y="86" width="20" height="20" rx="4"/>
+    <rect x="134" y="110" width="20" height="20" rx="4"/>
+    <rect x="134" y="134" width="20" height="20" rx="4"/>
   </g>
 </svg>

public/pwa-192x192.svg

@@ -8,17 +8,37 @@
       <stop offset="0" stop-color="#00f2fe"/>
       <stop offset="1" stop-color="#4facfe"/>
     </linearGradient>
+    <filter id="glow" x="-20%" y="-20%" width="140%" height="140%">
+      <feGaussianBlur stdDeviation="1.5" result="blur"/>
+      <feComposite in="SourceGraphic" in2="blur" operator="over"/>
+    </filter>
   </defs>
-  <rect width="192" height="192" rx="28" fill="url(#bg)"/>
+  
-  <rect x="28" y="28" width="136" height="136" rx="14" fill="rgba(0,0,0,0.35)"/>
+  <!-- Main Background -->
-  <g fill="url(#cell)">
+  <rect width="192" height="192" rx="42" fill="url(#bg)"/>
-    <rect x="48" y="48" width="20" height="20" rx="4"/>
+  
-    <rect x="76" y="48" width="20" height="20" rx="4"/>
+  <!-- Console Screen Background -->
-    <rect x="104" y="48" width="20" height="20" rx="4"/>
+  <rect x="26" y="26" width="140" height="140" rx="16" fill="rgba(0,10,30,0.5)" stroke="rgba(0,242,254,0.2)" stroke-width="1.5"/>
-    <rect x="48" y="76" width="20" height="20" rx="4"/>
+
-    <rect x="104" y="76" width="20" height="20" rx="4"/>
+  <!-- Letter N built from Nonogram cells -->
-    <rect x="48" y="104" width="20" height="20" rx="4"/>
+  <g fill="url(#cell)" filter="url(#glow)">
-    <rect x="76" y="104" width="20" height="20" rx="4"/>
+    <!-- Left Column -->
-    <rect x="104" y="104" width="20" height="20" rx="4"/>
+    <rect x="38" y="38" width="20" height="20" rx="4"/>
+    <rect x="38" y="62" width="20" height="20" rx="4"/>
+    <rect x="38" y="86" width="20" height="20" rx="4"/>
+    <rect x="38" y="110" width="20" height="20" rx="4"/>
+    <rect x="38" y="134" width="20" height="20" rx="4"/>
+    
+    <!-- Diagonal -->
+    <rect x="62" y="62" width="20" height="20" rx="4"/>
+    <rect x="86" y="86" width="20" height="20" rx="4"/>
+    <rect x="110" y="110" width="20" height="20" rx="4"/>
+    
+    <!-- Right Column -->
+    <rect x="134" y="38" width="20" height="20" rx="4"/>
+    <rect x="134" y="62" width="20" height="20" rx="4"/>
+    <rect x="134" y="86" width="20" height="20" rx="4"/>
+    <rect x="134" y="110" width="20" height="20" rx="4"/>
+    <rect x="134" y="134" width="20" height="20" rx="4"/>
   </g>
 </svg>

public/pwa-512x512.svg

@@ -1,4 +1,4 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="512" height="512" viewBox="0 0 512 512">
+<svg xmlns="http://www.w3.org/2000/svg" width="512" height="512" viewBox="0 0 192 192">
   <defs>
     <linearGradient id="bg" x1="0" y1="0" x2="1" y2="1">
       <stop offset="0" stop-color="#43C6AC"/>
@@ -8,17 +8,37 @@
       <stop offset="0" stop-color="#00f2fe"/>
       <stop offset="1" stop-color="#4facfe"/>
     </linearGradient>
+    <filter id="glow" x="-20%" y="-20%" width="140%" height="140%">
+      <feGaussianBlur stdDeviation="1.5" result="blur"/>
+      <feComposite in="SourceGraphic" in2="blur" operator="over"/>
+    </filter>
   </defs>
-  <rect width="512" height="512" rx="80" fill="url(#bg)"/>
+  
-  <rect x="74" y="74" width="364" height="364" rx="40" fill="rgba(0,0,0,0.35)"/>
+  <!-- Main Background -->
-  <g fill="url(#cell)">
+  <rect width="192" height="192" rx="42" fill="url(#bg)"/>
-    <rect x="138" y="138" width="54" height="54" rx="10"/>
+  
-    <rect x="214" y="138" width="54" height="54" rx="10"/>
+  <!-- Console Screen Background -->
-    <rect x="290" y="138" width="54" height="54" rx="10"/>
+  <rect x="26" y="26" width="140" height="140" rx="16" fill="rgba(0,10,30,0.5)" stroke="rgba(0,242,254,0.2)" stroke-width="1.5"/>
-    <rect x="138" y="214" width="54" height="54" rx="10"/>
+
-    <rect x="290" y="214" width="54" height="54" rx="10"/>
+  <!-- Letter N built from Nonogram cells -->
-    <rect x="138" y="290" width="54" height="54" rx="10"/>
+  <g fill="url(#cell)" filter="url(#glow)">
-    <rect x="214" y="290" width="54" height="54" rx="10"/>
+    <!-- Left Column -->
-    <rect x="290" y="290" width="54" height="54" rx="10"/>
+    <rect x="38" y="38" width="20" height="20" rx="4"/>
+    <rect x="38" y="62" width="20" height="20" rx="4"/>
+    <rect x="38" y="86" width="20" height="20" rx="4"/>
+    <rect x="38" y="110" width="20" height="20" rx="4"/>
+    <rect x="38" y="134" width="20" height="20" rx="4"/>
+    
+    <!-- Diagonal -->
+    <rect x="62" y="62" width="20" height="20" rx="4"/>
+    <rect x="86" y="86" width="20" height="20" rx="4"/>
+    <rect x="110" y="110" width="20" height="20" rx="4"/>
+    
+    <!-- Right Column -->
+    <rect x="134" y="38" width="20" height="20" rx="4"/>
+    <rect x="134" y="62" width="20" height="20" rx="4"/>
+    <rect x="134" y="86" width="20" height="20" rx="4"/>
+    <rect x="134" y="110" width="20" height="20" rx="4"/>
+    <rect x="134" y="134" width="20" height="20" rx="4"/>
   </g>
 </svg>

scripts/fill_language_labels.cjs

@@ -0,0 +1,49 @@
+const fs = require('fs');
+const path = 'src/composables/useI18n.js';
+let content = fs.readFileSync(path, 'utf8');
+
+const messagesMatch = content.match(/const messages = ({[\s\S]*?});/);
+if (!messagesMatch) {
+  console.error('Could not find messages object');
+  process.exit(1);
+}
+
+const messages = eval(`(${messagesMatch[1]})`);
+const en = messages.en || {};
+const allLangKeys = Object.keys(en).filter((k) => k.startsWith('language.'));
+
+function injectMissingLanguageLabels(localeCode) {
+  const blockStartRegex = new RegExp(`\\s{2}['\"]?${localeCode}['\"]?\\s*:\\s*\\{`);
+  const startIndex = content.search(blockStartRegex);
+  if (startIndex === -1) return;
+  const braceStart = content.indexOf('{', startIndex);
+  let i = braceStart + 1;
+  let depth = 1;
+  while (i < content.length && depth > 0) {
+    if (content[i] === '{') depth++;
+    else if (content[i] === '}') depth--;
+    i++;
+  }
+  const block = content.slice(braceStart + 1, i - 1);
+  let updated = block;
+  let addedAny = false;
+  allLangKeys.forEach((key) => {
+    const keyRegex = new RegExp(`(['\"])${key}\\1\\s*:\\s*(['\"]).*?\\2`);
+    if (!keyRegex.test(updated)) {
+      const value = en[key];
+      updated = updated.trim().endsWith(',') ? updated + `\n    '${key}': '${value}'` : updated + `,\n    '${key}': '${value}'`;
+      addedAny = true;
+    }
+  });
+  if (addedAny) {
+    content = content.slice(0, braceStart + 1) + updated + content.slice(i - 1);
+  }
+}
+
+Object.keys(messages).forEach((locale) => {
+  if (locale === 'en') return;
+  injectMissingLanguageLabels(locale);
+});
+
+fs.writeFileSync(path, content);
+console.log('Filled missing language.* labels for all locales.');

scripts/generate-icons.js

@@ -0,0 +1,42 @@
+import sharp from 'sharp';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const INPUT_FILE = path.join(__dirname, '../public/nonograms.svg');
+const OUTPUT_DIR = path.join(__dirname, '../public');
+
+async function generateIcons() {
+  console.log('Generating icons from ' + INPUT_FILE);
+
+  try {
+    // 192x192
+    await sharp(INPUT_FILE)
+      .resize(192, 192)
+      .png()
+      .toFile(path.join(OUTPUT_DIR, 'pwa-192x192.png'));
+    console.log('Created pwa-192x192.png');
+
+    // 512x512
+    await sharp(INPUT_FILE)
+      .resize(512, 512)
+      .png()
+      .toFile(path.join(OUTPUT_DIR, 'pwa-512x512.png'));
+    console.log('Created pwa-512x512.png');
+
+    // Apple Touch Icon (180x180)
+    await sharp(INPUT_FILE)
+      .resize(180, 180)
+      .png()
+      .toFile(path.join(OUTPUT_DIR, 'apple-touch-icon.png'));
+    console.log('Created apple-touch-icon.png');
+    
+  } catch (err) {
+    console.error('Error generating icons:', err);
+    process.exit(1);
+  }
+}
+
+generateIcons();

scripts/run_simulation.mjs

@@ -0,0 +1,47 @@
+
+import { generateRandomGrid, calculateHints } from '../src/utils/puzzleUtils.js';
+import { solvePuzzle } from '../src/utils/solver.js';
+import fs from 'fs';
+
+const SIZES = [5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80];
+const DENSITIES = [0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9];
+const SAMPLES = 200; // High sample count for stability
+
+console.log('Starting simulation...');
+console.log(`Sizes: ${SIZES.join(', ')}`);
+console.log(`Densities: ${DENSITIES.join(', ')}`);
+console.log(`Samples per point: ${SAMPLES}`);
+
+const results = {};
+
+async function run() {
+    const totalSteps = SIZES.length * DENSITIES.length;
+    let currentStep = 0;
+    const startTime = Date.now();
+
+    for (const size of SIZES) {
+        results[size] = [];
+        for (const density of DENSITIES) {
+            let totalSolved = 0;
+            for (let i = 0; i < SAMPLES; i++) {
+                const grid = generateRandomGrid(size, density);
+                const { rowHints, colHints } = calculateHints(grid);
+                const { percentSolved } = solvePuzzle(rowHints, colHints);
+                totalSolved += percentSolved;
+            }
+            const avg = Math.round(totalSolved / SAMPLES);
+            results[size].push(avg);
+            
+            currentStep++;
+            const pct = Math.round((currentStep / totalSteps) * 100);
+            const elapsed = ((Date.now() - startTime) / 1000).toFixed(0);
+            process.stdout.write(`\rProgress: ${pct}% (${currentStep}/${totalSteps}) - Elapsed: ${elapsed}s`);
+        }
+    }
+    
+    console.log('\n\nSimulation complete!');
+    console.log('SIM_DATA = ' + JSON.stringify(results, null, 4) + ';');
+    fs.writeFileSync('simulation_results.json', JSON.stringify(results, null, 4));
+}
+
+run();

scripts/simulate_difficulty.js

@@ -1,75 +1,38 @@
-
-import fs from 'fs';
-import path from 'path';
 import { generateRandomGrid, calculateHints } from '../src/utils/puzzleUtils.js';
 import { solvePuzzle } from '../src/utils/solver.js';
 
-const OUTPUT_FILE = 'difficulty_simulation_results.json';
+const SIZES = [5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80];
-const CSV_FILE = 'difficulty_simulation_results.csv';
-
-// Configuration
-const SIZES = [5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80]; // Steps of 5 up to 50, then 10
 const DENSITIES = [0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9];
-const SAMPLES_PER_POINT = 20; // Adjust based on time/accuracy needs
+const SAMPLES_SMALL = 100; // For size <= 25
+const SAMPLES_LARGE = 30;  // For size > 25
 
-console.log('Starting Monte Carlo Simulation for Nonogram Difficulty...');
+const results = {};
-console.log(`Config: Sizes=${SIZES.length}, Densities=${DENSITIES.length}, Samples=${SAMPLES_PER_POINT}`);
 
-const results = [];
+console.log('Starting Monte Carlo Simulation...');
-const csvRows = ['size,density,avg_solved_percent,min_solved_percent,max_solved_percent,avg_time_ms'];
 
 const startTime = Date.now();
 
 for (const size of SIZES) {
+    const samples = size <= 25 ? SAMPLES_SMALL : SAMPLES_LARGE;
+    const rowData = [];
+    
     for (const density of DENSITIES) {
         let totalSolved = 0;
-        let minSolved = 100;
-        let maxSolved = 0;
-        let totalTime = 0;
         
-        process.stdout.write(`Simulating Size: ${size}x${size}, Density: ${density} ... `);
+        for (let i = 0; i < samples; i++) {
-
-        for (let i = 0; i < SAMPLES_PER_POINT; i++) {
-            const t0 = performance.now();
-            
-            // 1. Generate
             const grid = generateRandomGrid(size, density);
             const { rowHints, colHints } = calculateHints(grid);
-            
-            // 2. Solve
             const { percentSolved } = solvePuzzle(rowHints, colHints);
-            
-            const t1 = performance.now();
-            
             totalSolved += percentSolved;
-            minSolved = Math.min(minSolved, percentSolved);
-            maxSolved = Math.max(maxSolved, percentSolved);
-            totalTime += (t1 - t0);
         }
         
-        const avgSolved = totalSolved / SAMPLES_PER_POINT;
+        const avg = Math.round(totalSolved / samples);
-        const avgTime = totalTime / SAMPLES_PER_POINT;
+        rowData.push(avg);
-
-        results.push({
-            size,
-            density,
-            avgSolved,
-            minSolved,
-            maxSolved,
-            avgTime
-        });
-
-        csvRows.push(`${size},${density},${avgSolved.toFixed(2)},${minSolved.toFixed(2)},${maxSolved.toFixed(2)},${avgTime.toFixed(2)}`);
-        
-        console.log(`Avg Solved: ${avgSolved.toFixed(1)}%`);
     }
+    results[size] = rowData;
+    console.log(`  Size ${size}: [${rowData.join(', ')}]`);
 }
 
-const totalDuration = (Date.now() - startTime) / 1000;
+const duration = (Date.now() - startTime) / 1000;
-console.log(`Simulation complete in ${totalDuration.toFixed(1)}s`);
+console.log(`\nSimulation Complete in ${duration.toFixed(2)}s. Result JSON:`);
-
+console.log(JSON.stringify(results, null, 4));
-// Save results
-fs.writeFileSync(OUTPUT_FILE, JSON.stringify(results, null, 2));
-fs.writeFileSync(CSV_FILE, csvRows.join('\n'));
-
-console.log(`Results saved to ${OUTPUT_FILE} and ${CSV_FILE}`);

scripts/translate_simulation.cjs

@@ -0,0 +1,514 @@
+const fs = require('fs');
+const path = 'src/composables/useI18n.js';
+let content = fs.readFileSync(path, 'utf8');
+
+const keys = {
+  'custom.showMap': {
+    es: 'Mostrar mapa de dificultad',
+    fr: 'Afficher la carte de difficulté',
+    de: 'Schwierigkeitskarte anzeigen',
+    it: 'Mostra mappa difficoltà',
+    pt: 'Mostrar mapa de dificuldade',
+    'pt-br': 'Mostrar mapa de dificuldade',
+    ru: 'Показать карту сложности',
+    zh: '显示难度地图',
+    ja: '難易度マップを表示',
+    ko: '난이도 맵 표시',
+    tr: 'Zorluk haritasını göster',
+    uk: 'Показати карту складності',
+    cs: 'Zobrazit mapu obtížnosti',
+    sk: 'Zobraziť mapu náročnosti',
+    hu: 'Nehézségi térkép megjelenítése',
+    ro: 'Arată harta dificultății',
+    bg: 'Покажи картата на трудността',
+    el: 'Εμφάνιση χάρτη δυσκολίας',
+    sr: 'Прикажи карту тежине',
+    hr: 'Prikaži kartu težine',
+    sl: 'Prikaži zemljevid težavnosti',
+    lt: 'Rodyti sudėtingumo žemėlapį',
+    lv: 'Rādīt grūtības karti',
+    et: 'Näita raskusaste kaarti',
+    nl: 'Moeilijkheidskaart weergeven',
+    sv: 'Visa svårighetskarta',
+    da: 'Vis sværhedsgradskort',
+    fi: 'Näytä vaikeuskartta',
+    no: 'Vis vanskelighetskart',
+    ar: 'إظهار خريطة الصعوبة',
+    hi: 'कठिनाई मानचित्र दिखाएँ',
+    bn: 'কঠিনতার মানচিত্র দেখান'
+  },
+  'custom.hideMap': {
+    es: 'Ocultar mapa de dificultad',
+    fr: 'Masquer la carte de difficulté',
+    de: 'Schwierigkeitskarte ausblenden',
+    it: 'Nascondi mappa difficoltà',
+    pt: 'Ocultar mapa de dificuldade',
+    'pt-br': 'Ocultar mapa de dificuldade',
+    ru: 'Скрыть карту сложности',
+    zh: '隐藏难度地图',
+    ja: '難易度マップを非表示',
+    ko: '난이도 맵 숨기기',
+    tr: 'Zorluk haritasını gizle',
+    uk: 'Приховати карту складності',
+    cs: 'Skrýt mapu obtížnosti',
+    sk: 'Skryť mapu náročnosti',
+    hu: 'Nehézségi térkép elrejtése',
+    ro: 'Ascunde harta dificultății',
+    bg: 'Скрий картата на трудността',
+    el: 'Απόκρυψη χάρτη δυσκολίας',
+    sr: 'Сакриј карту тежине',
+    hr: 'Sakrij kartu težine',
+    sl: 'Skrij zemljevid težavnosti',
+    lt: 'Slėpti sudėtingumo žemėlapį',
+    lv: 'Paslēpt grūtības karti',
+    et: 'Peida raskusaste kaart',
+    nl: 'Moeilijkheidskaart verbergen',
+    sv: 'Dölj svårighetskarta',
+    da: 'Skjul sværhedsgradskort',
+    fi: 'Piilota vaikeuskartta',
+    no: 'Skjul vanskelighetskart',
+    ar: 'إخفاء خريطة الصعوبة',
+    hi: 'कठिनाई मानचित्र छुपाएँ',
+    bn: 'কঠিনতার মানচিত্র লুকান'
+  },
+  'simulation.title': {
+    es: 'Simulación de Dificultad',
+    fr: 'Simulation de difficulté',
+    de: 'Schwierigkeitssimulation',
+    it: 'Simulazione della difficoltà',
+    pt: 'Simulação de Dificuldade',
+    'pt-br': 'Simulação de Dificuldade',
+    ru: 'Симуляция сложности',
+    zh: '难度模拟',
+    ja: '難易度シミュレーション',
+    ko: '난이도 시뮬레이션',
+    tr: 'Zorluk simülasyonu',
+    uk: 'Симуляція складності',
+    cs: 'Simulace obtížnosti',
+    sk: 'Simulácia náročnosti',
+    hu: 'Nehézség szimuláció',
+    ro: 'Simulare de dificultate',
+    bg: 'Симулиране на трудност',
+    el: 'Προσομοίωση δυσκολίας',
+    sr: 'Симулација тежине',
+    hr: 'Simulacija težine',
+    sl: 'Simulacija težavnosti',
+    lt: 'Sudėtingumo simuliacija',
+    lv: 'Grūtības simulācija',
+    et: 'Raskusastme simulatsioon',
+    nl: 'Moeilijkheidssimulatie',
+    sv: 'Svårighetssimulering',
+    da: 'Sværhedsgradssimulering',
+    fi: 'Vaikeussimulointi',
+    no: 'Vanskelighetssimulering',
+    ar: 'محاكاة الصعوبة',
+    hi: 'कठिनाई सिमुलेशन',
+    bn: 'কঠিনতা সিমুলেশন'
+  },
+  'simulation.status.ready': {
+    es: 'Listo',
+    fr: 'Prêt',
+    de: 'Bereit',
+    it: 'Pronto',
+    pt: 'Pronto',
+    'pt-br': 'Pronto',
+    ru: 'Готово',
+    zh: '就绪',
+    ja: '準備完了',
+    ko: '준비됨',
+    tr: 'Hazır',
+    uk: 'Готово',
+    cs: 'Připraveno',
+    sk: 'Pripravené',
+    hu: 'Kész',
+    ro: 'Gata',
+    bg: 'Готово',
+    el: 'Έτοιμο',
+    sr: 'Спремно',
+    hr: 'Spremno',
+    sl: 'Pripravljeno',
+    lt: 'Paruošta',
+    lv: 'Gatavs',
+    et: 'Valmis',
+    nl: 'Gereed',
+    sv: 'Klar',
+    da: 'Klar',
+    fi: 'Valmis',
+    no: 'Klar',
+    ar: 'جاهز',
+    hi: 'तैयार',
+    bn: 'প্রস্তুত'
+  },
+  'simulation.status.stopped': {
+    es: 'Detenido',
+    fr: 'Arrêté',
+    de: 'Gestoppt',
+    it: 'Arrestato',
+    pt: 'Parado',
+    'pt-br': 'Parado',
+    ru: 'Остановлено',
+    zh: '已停止',
+    ja: '停止',
+    ko: '중지됨',
+    tr: 'Durduruldu',
+    uk: 'Зупинено',
+    cs: 'Zastaveno',
+    sk: 'Zastavené',
+    hu: 'Leállítva',
+    ro: 'Oprit',
+    bg: 'Спряно',
+    el: 'Διακοπή',
+    sr: 'Заустављено',
+    hr: 'Zaustavljeno',
+    sl: 'Ustavljeno',
+    lt: 'Sustabdyta',
+    lv: 'Apturēts',
+    et: 'Peatatud',
+    nl: 'Gestopt',
+    sv: 'Stoppad',
+    da: 'Stoppet',
+    fi: 'Pysäytetty',
+    no: 'Stoppet',
+    ar: 'متوقف',
+    hi: 'रोका गया',
+    bn: 'বন্ধ'
+  },
+  'simulation.status.completed': {
+    es: 'Completado',
+    fr: 'Terminé',
+    de: 'Abgeschlossen',
+    it: 'Completato',
+    pt: 'Concluído',
+    'pt-br': 'Concluído',
+    ru: 'Завершено',
+    zh: '已完成',
+    ja: '完了',
+    ko: '완료됨',
+    tr: 'Tamamlandı',
+    uk: 'Завершено',
+    cs: 'Dokončeno',
+    sk: 'Dokončené',
+    hu: 'Befejezve',
+    ro: 'Finalizat',
+    bg: 'Завършено',
+    el: 'Ολοκληρώθηκε',
+    sr: 'Завршено',
+    hr: 'Dovršeno',
+    sl: 'Dokončano',
+    lt: 'Baigta',
+    lv: 'Pabeigts',
+    et: 'Lõpetatud',
+    nl: 'Voltooid',
+    sv: 'Slutförd',
+    da: 'Fuldført',
+    fi: 'Valmis',
+    no: 'Fullført',
+    ar: 'مكتمل',
+    hi: 'पूर्ण',
+    bn: 'সম্পন্ন'
+  },
+  'simulation.status.simulating': {
+    es: 'Simulando {size}x{size} @ {density}%',
+    fr: 'Simulation de {size}x{size} à {density}%',
+    de: 'Simuliere {size}x{size} @ {density}%',
+    it: 'Simulazione {size}x{size} @ {density}%',
+    pt: 'Simulando {size}x{size} @ {density}%',
+    'pt-br': 'Simulando {size}x{size} @ {density}%',
+    ru: 'Симуляция {size}x{size} @ {density}%',
+    zh: '正在模拟 {size}x{size} @ {density}%',
+    ja: '{size}x{size} @ {density}% をシミュレーション中',
+    ko: '{size}x{size} @ {density}% 시뮬레이션 중',
+    tr: '{size}x{size} @ {density}% simüle ediliyor',
+    uk: 'Симулювання {size}x{size} @ {density}%',
+    cs: 'Simulace {size}x{size} @ {density}%',
+    sk: 'Simulácia {size}x{size} @ {density}%',
+    hu: 'Szimulálás {size}x{size} @ {density}%',
+    ro: 'Simulare {size}x{size} @ {density}%',
+    bg: 'Симулиране {size}x{size} @ {density}%',
+    el: 'Προσομοίωση {size}x{size} @ {density}%',
+    sr: 'Симулирање {size}x{size} @ {density}%',
+    hr: 'Simulacija {size}x{size} @ {density}%',
+    sl: 'Simulacija {size}x{size} @ {density}%',
+    lt: 'Simuliuojama {size}x{size} @ {density}%',
+    lv: 'Simulācija {size}x{size} @ {density}%',
+    et: 'Simuleerimine {size}x{size} @ {density}%',
+    nl: 'Simuleren {size}x{size} @ {density}%',
+    sv: 'Simulerar {size}x{size} @ {density}%',
+    da: 'Simulerer {size}x{size} @ {density}%',
+    fi: 'Simulointi {size}x{size} @ {density}%',
+    no: 'Simulerer {size}x{size} @ {density}%',
+    ar: 'محاكاة {size}x{size} @ {density}%',
+    hi: '{size}x{size} @ {density}% का सिमुलेशन',
+    bn: '{size}x{size} @ {density}% সিমুলেট করা হচ্ছে'
+  },
+  'simulation.start': {
+    es: 'Iniciar simulación',
+    fr: 'Démarrer la simulation',
+    de: 'Simulation starten',
+    it: 'Avvia simulazione',
+    pt: 'Iniciar simulação',
+    'pt-br': 'Iniciar simulação',
+    ru: 'Начать симуляцию',
+    zh: '开始模拟',
+    ja: 'シミュレーション開始',
+    ko: '시뮬레이션 시작',
+    tr: 'Simülasyonu başlat',
+    uk: 'Почати симуляцію',
+    cs: 'Spustit simulaci',
+    sk: 'Spustiť simuláciu',
+    hu: 'Szimuláció indítása',
+    ro: 'Pornește simularea',
+    bg: 'Стартирай симулация',
+    el: 'Έναρξη προσομοίωσης',
+    sr: 'Покрени симулацију',
+    hr: 'Pokreni simulaciju',
+    sl: 'Zaženi simulacijo',
+    lt: 'Pradėti simuliaciją',
+    lv: 'Sākt simulāciju',
+    et: 'Alusta simulatsiooni',
+    nl: 'Simulatie starten',
+    sv: 'Starta simulering',
+    da: 'Start simulering',
+    fi: 'Aloita simulointi',
+    no: 'Start simulering',
+    ar: 'بدء المحاكاة',
+    hi: 'सिमुलेशन शुरू करें',
+    bn: 'সিমুলেশন শুরু'
+  },
+  'simulation.stop': {
+    es: 'Detener',
+    fr: 'Arrêter',
+    de: 'Stoppen',
+    it: 'Stop',
+    pt: 'Parar',
+    'pt-br': 'Parar',
+    ru: 'Стоп',
+    zh: '停止',
+    ja: '停止',
+    ko: '중지',
+    tr: 'Durdur',
+    uk: 'Зупинити',
+    cs: 'Zastavit',
+    sk: 'Zastaviť',
+    hu: 'Leállítás',
+    ro: 'Oprește',
+    bg: 'Спри',
+    el: 'Διακοπή',
+    sr: 'Заустави',
+    hr: 'Zaustavi',
+    sl: 'Ustavi',
+    lt: 'Stabdyti',
+    lv: 'Apturēt',
+    et: 'Peata',
+    nl: 'Stoppen',
+    sv: 'Stoppa',
+    da: 'Stop',
+    fi: 'Pysäytä',
+    no: 'Stopp',
+    ar: 'إيقاف',
+    hi: 'रोकें',
+    bn: 'বন্ধ করুন'
+  },
+  'simulation.table.size': {
+    es: 'Tamaño',
+    fr: 'Taille',
+    de: 'Größe',
+    it: 'Dimensione',
+    pt: 'Tamanho',
+    'pt-br': 'Tamanho',
+    ru: 'Размер',
+    zh: '大小',
+    ja: 'サイズ',
+    ko: '크기',
+    tr: 'Boyut',
+    uk: 'Розмір',
+    cs: 'Velikost',
+    sk: 'Veľkosť',
+    hu: 'Méret',
+    ro: 'Dimensiune',
+    bg: 'Размер',
+    el: 'Μέγεθος',
+    sr: 'Величина',
+    hr: 'Veličina',
+    sl: 'Velikost',
+    lt: 'Dydis',
+    lv: 'Izmērs',
+    et: 'Suurus',
+    nl: 'Grootte',
+    sv: 'Storlek',
+    da: 'Størrelse',
+    fi: 'Koko',
+    no: 'Størrelse',
+    ar: 'الحجم',
+    hi: 'आकार',
+    bn: 'আকার'
+  },
+  'simulation.table.density': {
+    es: 'Densidad',
+    fr: 'Densité',
+    de: 'Dichte',
+    it: 'Densità',
+    pt: 'Densidade',
+    'pt-br': 'Densidade',
+    ru: 'Плотность',
+    zh: '密度',
+    ja: '密度',
+    ko: '밀도',
+    tr: 'Yoğunluk',
+    uk: 'Щільність',
+    cs: 'Hustota',
+    sk: 'Hustota',
+    hu: 'Sűrűség',
+    ro: 'Densitate',
+    bg: 'Плътност',
+    el: 'Πυκνότητα',
+    sr: 'Густина',
+    hr: 'Gustoća',
+    sl: 'Gostota',
+    lt: 'Tankis',
+    lv: 'Blīvums',
+    et: 'Tihedus',
+    nl: 'Dichtheid',
+    sv: 'Densitet',
+    da: 'Densitet',
+    fi: 'Tiheys',
+    no: 'Tetthet',
+    ar: 'الكثافة',
+    hi: 'घनत्व',
+    bn: 'ঘনত্ব'
+  },
+  'simulation.table.solved': {
+    es: 'Resuelto (Lógica)',
+    fr: 'Résolu (Logique)',
+    de: 'Gelöst (Logik)',
+    it: 'Risolto (Logica)',
+    pt: 'Resolvido (Lógica)',
+    'pt-br': 'Resolvido (Lógica)',
+    ru: 'Решено (Логика)',
+    zh: '已解（逻辑）',
+    ja: '解決（ロジック）',
+    ko: '해결됨(논리)',
+    tr: 'Çözüldü (Mantık)',
+    uk: 'Розв’язано (Логіка)',
+    cs: 'Vyřešeno (Logika)',
+    sk: 'Vyriešené (Logika)',
+    hu: 'Megoldva (Logika)',
+    ro: 'Rezolvat (Logică)',
+    bg: 'Решено (Логика)',
+    el: 'Επιλύθηκε (Λογική)',
+    sr: 'Решено (Логика)',
+    hr: 'Riješeno (Logika)',
+    sl: 'Rešeno (Logika)',
+    lt: 'Išspręsta (Logika)',
+    lv: 'Atrisināts (Loģika)',
+    et: 'Lahendatud (Loogika)',
+    nl: 'Opgelost (Logica)',
+    sv: 'Löst (Logik)',
+    da: 'Løst (Logik)',
+    fi: 'Ratkaistu (Logiikka)',
+    no: 'Løst (Logikk)',
+    ar: 'تم الحل (منطق)',
+    hi: 'हल (तर्क)',
+    bn: 'সমাধান (লজিক)'
+  },
+  'simulation.empty': {
+    es: 'Pulsa Iniciar para ejecutar la simulación Monte Carlo',
+    fr: 'Appuyez sur Démarrer pour lancer la simulation Monte Carlo',
+    de: 'Drücke Start, um die Monte-Carlo-Simulation zu starten',
+    it: 'Premi Avvia per eseguire la simulazione Monte Carlo',
+    pt: 'Pressione Iniciar para executar a simulação de Monte Carlo',
+    'pt-br': 'Pressione Iniciar para executar a simulação de Monte Carlo',
+    ru: 'Нажмите «Старт», чтобы запустить моделирование Монте‑Карло',
+    zh: '点击开始运行蒙特卡罗模拟',
+    ja: 'Monte Carlo シミュレーションを実行するには開始を押してください',
+    ko: 'Monte Carlo 시뮬레이션을 실행하려면 시작을 누르세요',
+    tr: 'Monte Carlo simülasyonunu çalıştırmak için Başlat’a basın',
+    uk: 'Натисніть «Почати», щоб запустити симуляцію Монте‑Карло',
+    cs: 'Stiskněte Start pro spuštění simulace Monte Carlo',
+    sk: 'Stlačte Štart pre spustenie simulácie Monte Carlo',
+    hu: 'Nyomd meg a Startot a Monte Carlo szimulációhoz',
+    ro: 'Apasă Start pentru a rula simularea Monte Carlo',
+    bg: 'Натисни Старт, за да стартираш симулация Монте Карло',
+    el: 'Πατήστε Έναρξη για να τρέξετε προσομοίωση Monte Carlo',
+    sr: 'Притисни Старт да покренеш Монте Карло симулацију',
+    hr: 'Pritisni Start za pokretanje Monte Carlo simulacije',
+    sl: 'Pritisnite Start za zagon simulacije Monte Carlo',
+    lt: 'Paspauskite Start, kad paleistumėte Monte Karlo simuliaciją',
+    lv: 'Nospiediet Start, lai palaistu Monte Carlo simulāciju',
+    et: 'Vajuta Start, et käivitada Monte Carlo simulatsioon',
+    nl: 'Druk op Start om de Monte Carlo-simulatie te starten',
+    sv: 'Tryck Start för att köra Monte Carlo-simuleringen',
+    da: 'Tryk Start for at køre Monte Carlo-simuleringen',
+    fi: 'Paina Käynnistä aloittaaksesi Monte Carlo -simulaation',
+    no: 'Trykk Start for å kjøre Monte Carlo-simuleringen',
+    ar: 'اضغط ابدأ لتشغيل محاكاة مونتِ كارلو',
+    hi: 'मोंटे कार्लो सिमुलेशन चलाने के लिए स्टार्ट दबाएँ',
+    bn: 'মোন্টে কার্লো সিমুলেশন চালাতে স্টার্ট চাপুন'
+  },
+  'custom.simulationHelp': {
+    es: '¿Cómo se calcula?',
+    fr: 'Comment est-ce calculé ?',
+    de: 'Wie wird das berechnet?',
+    it: 'Come viene calcolato?',
+    pt: 'Como isso é calculado?',
+    'pt-br': 'Como isso é calculado?',
+    ru: 'Как это рассчитывается?',
+    zh: '这是如何计算的？',
+    ja: 'これはどのように計算されますか？',
+    ko: '이것은 어떻게 계산됩니까?',
+    tr: 'Bu nasıl hesaplanıyor?',
+    uk: 'Як це обчислюється?',
+    cs: 'Jak se to počítá?',
+    sk: 'Ako sa to počíta?',
+    hu: 'Hogyan számoljuk?',
+    ro: 'Cum este calculat?',
+    bg: 'Как се изчислява?',
+    el: 'Πώς υπολογίζεται;',
+    sr: 'Како се израчунава?',
+    hr: 'Kako se izračunava?',
+    sl: 'Kako je izračunano?',
+    lt: 'Kaip tai apskaičiuojama?',
+    lv: 'Kā tas tiek aprēķināts?',
+    et: 'Kuidas see arvutatakse?',
+    nl: 'Hoe wordt dit berekend?',
+    sv: 'Hur beräknas detta?',
+    da: 'Hvordan beregnes dette?',
+    fi: 'Miten tämä lasketaan?',
+    no: 'Hvordan beregnes dette?',
+    ar: 'كيف يتم احتساب ذلك؟',
+    hi: 'यह कैसे गणना किया जाता है?',
+    bn: 'এটি কীভাবে গণনা করা হয়?'
+  }
+};
+
+function replaceInLanguage(lang, key, value) {
+  const langStart = new RegExp(`\\s{2}['\"]?${lang}['\"]?\\s*:\\s*\\{`);
+  const index = content.search(langStart);
+  if (index === -1) return;
+  const start = content.indexOf('{', index);
+  let depth = 1;
+  let i = start + 1;
+  while (i < content.length && depth > 0) {
+    if (content[i] === '{') depth++;
+    else if (content[i] === '}') depth--;
+    i++;
+  }
+  const block = content.slice(start + 1, i - 1);
+  let newBlock;
+  const keyRegex = new RegExp(`(['\"])${key}\\1\\s*:\\s*(['\"]).*?\\2`);
+  if (keyRegex.test(block)) {
+    newBlock = block.replace(keyRegex, `'${key}': '${value}'`);
+  } else {
+    newBlock = block.trim().endsWith(',') ? block + `\n    '${key}': '${value}'` : block + `,\n    '${key}': '${value}'`;
+  }
+  content = content.slice(0, start + 1) + newBlock + content.slice(i - 1);
+}
+
+Object.entries(keys).forEach(([key, translations]) => {
+  Object.entries(translations).forEach(([lang, value]) => {
+    replaceInLanguage(lang, key, value);
+  });
+});
+
+fs.writeFileSync(path, content);
+console.log('Translations updated.');

src/App.vue

@@ -8,6 +8,7 @@ import StatusPanel from './components/StatusPanel.vue';
 import GuidePanel from './components/GuidePanel.vue';
 import WinModal from './components/WinModal.vue';
 import CustomGameModal from './components/CustomGameModal.vue';
+import ImageImportModal from './components/ImageImportModal.vue';
 import SimulationView from './components/SimulationView.vue';
 import FixedBar from './components/FixedBar.vue';
 import ReloadPrompt from './components/ReloadPrompt.vue';
@@ -16,6 +17,7 @@ import ReloadPrompt from './components/ReloadPrompt.vue';
 const store = usePuzzleStore();
 const { t, locale, setLocale, locales } = useI18n();
 const showCustomModal = ref(false);
+const showImageImportModal = ref(false);
 const showSimulation = ref(false);
 const showGuide = ref(false);
 const deferredPrompt = ref(null);
@@ -23,6 +25,8 @@ const canInstall = ref(false);
 const installDismissed = ref(false);
 const isCoarsePointer = ref(false);
 const isStandalone = ref(false);
+const isIos = ref(false);
+const isDev = ref(false);
 const themePreference = ref('system');
 const appVersion = __APP_VERSION__;
 let displayModeMedia = null;
@@ -38,6 +42,10 @@ const onKeyDownGlobal = (e) => {
     showCustomModal.value = false;
     return;
   }
+  if (showImageImportModal.value) {
+    showImageImportModal.value = false;
+    return;
+  }
   if (store.isGameWon) {
     store.closeWinModal();
   }
@@ -58,7 +66,7 @@ const updateStandalone = () => {
 const handleBeforeInstallPrompt = (e) => {
   e.preventDefault();
   deferredPrompt.value = e;
-  if (!isStandalone.value) {
+  if (!isStandalone.value && !isDev.value) {
     canInstall.value = true;
   }
 };
@@ -109,6 +117,9 @@ onMounted(() => {
   }
   if (typeof window !== 'undefined') {
     isCoarsePointer.value = window.matchMedia('(pointer: coarse)').matches;
+    const ua = navigator.userAgent.toLowerCase();
+    isIos.value = /ipad|iphone|ipod/.test(ua) || (ua.includes('mac') && navigator.maxTouchPoints > 1);
+    isDev.value = window.location.port !== '' && window.location.port !== '80' && window.location.port !== '443';
     const storedTheme = typeof localStorage !== 'undefined' ? localStorage.getItem('theme') : null;
     if (storedTheme === 'light' || storedTheme === 'dark' || storedTheme === 'system') {
       themePreference.value = storedTheme;
@@ -155,18 +166,30 @@ onUnmounted(() => {
   <main class="game-container">
     <NavBar 
       @open-custom="showCustomModal = true" 
+      @open-image-import="showImageImportModal = true"
       @toggle-guide="showGuide = !showGuide"
       @set-theme="setThemePreference"
     />
     <FixedBar />
 
-    <div v-if="canInstall && !installDismissed" class="install-banner">
+    <div v-if="!isDev && (canInstall || (isIos && !isStandalone)) && !installDismissed" class="install-banner">
-      <div class="install-text">{{ t('pwa.installTitle') }}</div>
+      <div class="install-content">
+        <img src="/pwa-192x192.png" alt="App Icon" class="install-icon" />
+        <div class="install-text">
+          <div class="install-title">{{ t('app.title') }}</div>
+          <div class="install-desc">
+            <span v-if="isIos && !isStandalone">{{ t('pwa.installIos') }}</span>
+            <span v-else>{{ t('pwa.installTitle') }}</span>
+          </div>
+        </div>
+      </div>
       <div class="install-actions">
-        <button class="btn-neon secondary install-btn" @click="handleInstall">
+        <button v-if="!isIos" class="btn-neon secondary install-btn" @click="handleInstall">
           {{ installLabel }}
         </button>
-        <button class="install-close" @click="installDismissed = true">×</button>
+        <button class="install-close" @click="installDismissed = true" aria-label="Close">
+          ✕
+        </button>
       </div>
     </div>
 
@@ -193,6 +216,10 @@ onUnmounted(() => {
     <Teleport to="body">
       <WinModal v-if="store.isGameWon" />
       <CustomGameModal v-if="showCustomModal" @close="showCustomModal = false" @open-simulation="showSimulation = true" />
+      <ImageImportModal 
+        v-if="showImageImportModal" 
+        @close="showImageImportModal = false"
+      />
       <SimulationView v-if="showSimulation" @close="showSimulation = false" />
       <ReloadPrompt />
     </Teleport>
@@ -203,7 +230,7 @@ onUnmounted(() => {
 .game-container {
   display: flex;
   flex-direction: column;
-  align-items: stretch; /* was center */
+  align-items: stretch;
   gap: 20px;
   width: 100%;
   padding-bottom: 50px;
@@ -211,38 +238,111 @@ onUnmounted(() => {
 }
 
 .install-banner {
-  background: var(--banner-bg);
+  position: fixed;
-  border: 1px solid var(--banner-border);
+  bottom: 0;
-  border-radius: 8px;
-  padding: 10px 20px;
-  display: flex;
-  justify-content: space-between;
-  align-items: center;
-  width: 90%;
-  max-width: 600px;
-  margin: 0 auto 20px auto; /* Center it manually */
-  box-shadow: var(--banner-shadow);
-  position: sticky;
   left: 0;
-  right: 0;
+  width: 100%;
+  background: var(--panel-bg);
+  backdrop-filter: blur(12px);
+  -webkit-backdrop-filter: blur(12px);
+  border-top: 1px solid var(--neon-cyan);
+  box-shadow: 0 -4px 30px rgba(0, 242, 254, 0.15);
+  padding: 16px 20px;
+  padding-bottom: max(16px, env(safe-area-inset-bottom));
+  display: flex;
+  flex-direction: column;
+  gap: 16px;
+  z-index: 2000;
+  animation: slideUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
+}
+
+@media (min-width: 768px) {
+  .install-banner {
+    width: 400px;
+    bottom: 24px;
+    right: 24px;
+    left: auto;
+    border-radius: 12px;
+    border: 1px solid var(--neon-cyan);
+    padding-bottom: 16px;
+  }
+}
+
+.install-content {
+  display: flex;
+  align-items: center;
+  gap: 16px;
+}
+
+.install-icon {
+  width: 48px;
+  height: 48px;
+  border-radius: 10px;
+  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
 }
 
 .install-text {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+}
+
+.install-title {
+  font-weight: bold;
+  color: var(--neon-cyan);
+  font-size: 1.1rem;
+}
+
+.install-desc {
+  font-size: 0.9rem;
   color: var(--text-color);
+  line-height: 1.3;
 }
 
 .install-actions {
   display: flex;
-  gap: 10px;
   align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+}
+
+.install-btn {
+  flex: 1;
+  padding: 10px;
+  font-size: 0.95rem;
+  justify-content: center;
 }
 
 .install-close {
   background: transparent;
   border: none;
   color: var(--text-muted);
-  font-size: 1.5rem;
+  font-size: 1.2rem;
   cursor: pointer;
+  width: 36px;
+  height: 36px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 50%;
+  transition: background 0.2s;
+}
+
+.install-close:hover {
+  background: rgba(255,255,255,0.1);
+  color: var(--text-color);
+}
+
+@keyframes slideUp {
+  from {
+    transform: translateY(100%);
+    opacity: 0;
+  }
+  to {
+    transform: translateY(0);
+    opacity: 1;
+  }
 }
 
 .game-layout {

src/components/Cell.vue

@@ -43,21 +43,30 @@ const handlePointerDown = (e) => {
   const now = Date.now();
   if (now - lastTap < 300) {
     // Double tap -> X (Force)
+    clearLongPress();
     emit('start-drag', props.r, props.c, true, true);
     lastTap = 0;
   } else {
     // Single tap / Start drag -> Fill
     emit('start-drag', props.r, props.c, false, false);
     lastTap = now;
+
+    // Start Long Press Timer
+    clearLongPress();
+    longPressTimer = setTimeout(() => {
+        if (navigator.vibrate) navigator.vibrate(50);
+        // Switch to Cross (Right click logic, force=true to overwrite the just-placed Fill)
+        emit('start-drag', props.r, props.c, true, true);
+    }, 500);
   }
 };
 
 const handlePointerUp = (e) => {
-  // Handled in pointerdown
+  clearLongPress();
 };
 
 const handlePointerCancel = (e) => {
-  // Handled in pointerdown
+  clearLongPress();
 };
 </script>
 
@@ -84,6 +93,7 @@ const handlePointerCancel = (e) => {
   height: var(--cell-size);
   background-color: var(--cell-empty);
   border: 1px solid var(--glass-border);
+  box-sizing: border-box;
   cursor: pointer;
   display: flex;
   justify-content: center;

src/components/CustomGameModal.vue

@@ -340,12 +340,20 @@ const confirm = () => {
   text-align: center;
   max-width: 800px;
   width: 90%;
+  max-height: 90vh;
+  overflow-y: auto;
   border: 1px solid var(--accent-cyan);
   box-shadow: 0 0 50px rgba(0, 242, 255, 0.2);
   animation: slideUp 0.3s ease;
   transition: all 0.3s ease-in-out;
 }
 
+@media (max-width: 768px), (max-height: 600px) {
+  .modal {
+    padding: 20px;
+  }
+}
+
 .modal-content {
     display: flex;
     flex-direction: row;

src/components/GameBoard.vue

@@ -10,6 +10,10 @@ const store = usePuzzleStore();
 const { rowHints, colHints } = useHints(computed(() => store.solution));
 const { startDrag, onMouseEnter, stopDrag } = useNonogram();
 
+// Compute grid dimensions from hints
+const gridRows = computed(() => rowHints.value.length);
+const gridCols = computed(() => colHints.value.length);
+
 const cellSize = ref(30);
 const rowHintsRef = ref(null);
 const activeRow = ref(null);
@@ -27,17 +31,28 @@ let dragStartLeft = 0;
 const checkScroll = () => {
   const el = scrollWrapper.value;
   if (!el) return;
+  
+  const content = el.firstElementChild;
+  const contentWidth = content ? content.offsetWidth : el.scrollWidth;
   const sw = el.scrollWidth;
   const cw = el.clientWidth;
   
   // Only show custom scrollbar on mobile/tablet (width < 768px) and if content overflows
   const isMobile = window.innerWidth <= 768;
-  showScrollbar.value = isMobile && (sw > cw + 1);
+  // Use contentWidth to check for overflow, as scrollWidth might be misleading
+  showScrollbar.value = isMobile && (contentWidth > cw + 1);
   
   if (showScrollbar.value) {
     // Thumb width percentage = (viewport / total) * 100
-    const ratio = cw / sw;
+    // Use contentWidth for more accurate ratio
+    const ratio = cw / contentWidth;
     thumbWidth.value = Math.max(10, ratio * 100);
+    
+    // Hide if content fits or almost fits (prevent useless scrollbar)
+    // Increased tolerance to 95%
+    if (ratio >= 0.95) {
+      showScrollbar.value = false;
+    }
   }
 };
 
@@ -132,13 +147,16 @@ const computeCellSize = () => {
   // Ensure we don't have negative space
   const availableForGrid = Math.max(0, containerWidth - hintWidth);
   
-  const size = Math.floor((availableForGrid - gridPad * 2 - (store.size - 1) * gap) / store.size);
+  // Calculate cell size based on width availability (columns)
+  // Vertical scrolling is acceptable, so we don't constrain by height (rows)
+  const cols = Math.max(1, gridCols.value);
+  const size = Math.floor((availableForGrid - gridPad * 2 - (cols - 1) * gap) / cols);
   
   if (isDesktop) {
       // Desktop: Allow overflow, use comfortable size
       cellSize.value = 30;
   } else {
-      // Mobile: Fit to screen
+      // Mobile: Fit to screen width
       // Keep min 18, max 36
       cellSize.value = Math.max(18, Math.min(36, size));
   }
@@ -175,21 +193,38 @@ const handleGridLeave = () => {
   activeCol.value = null;
 };
 
+const handleResize = () => {
+  computeCellSize();
+  checkScroll();
+  // Re-check after potential layout animation/transition
+  setTimeout(() => {
+    computeCellSize();
+    checkScroll();
+  }, 300);
+};
+
 onMounted(() => {
   nextTick(() => {
     computeCellSize();
+    checkScroll();
+    // Extra check for slow layout/font loading or orientation changes
+    setTimeout(() => {
+      computeCellSize();
+      checkScroll();
+    }, 300);
   });
   isFinePointer.value = window.matchMedia('(pointer: fine)').matches;
-  window.addEventListener('resize', computeCellSize);
+  
-  window.addEventListener('resize', checkScroll);
+  window.addEventListener('resize', handleResize);
+  window.addEventListener('orientationchange', handleResize);
   window.addEventListener('mouseup', handleGlobalMouseUp);
   window.addEventListener('pointerup', handleGlobalPointerUp);
   window.addEventListener('touchend', handleGlobalPointerUp, { passive: true });
 });
 
 onUnmounted(() => {
-  window.removeEventListener('resize', computeCellSize);
+  window.removeEventListener('resize', handleResize);
-  window.removeEventListener('resize', checkScroll);
+  window.removeEventListener('orientationchange', handleResize);
   window.removeEventListener('mouseup', handleGlobalMouseUp);
   window.removeEventListener('pointerup', handleGlobalPointerUp);
   window.removeEventListener('touchend', handleGlobalPointerUp);
@@ -199,6 +234,10 @@ watch(() => store.size, async () => {
   await nextTick();
   computeCellSize();
   checkScroll();
+  setTimeout(() => {
+    computeCellSize();
+    checkScroll();
+  }, 300);
 });
 </script>
 
@@ -208,17 +247,17 @@ watch(() => store.size, async () => {
       <div class="corner-spacer"></div>
       
       <!-- Column Hints -->
-      <Hints :hints="colHints" orientation="col" :size="store.size" :activeIndex="activeCol" />
+      <Hints :hints="colHints" orientation="col" :size="gridCols" :activeIndex="activeCol" />
       
       <!-- Row Hints -->
-      <Hints ref="rowHintsRef" :hints="rowHints" orientation="row" :size="store.size" :activeIndex="activeRow" />
+      <Hints ref="rowHintsRef" :hints="rowHints" orientation="row" :size="gridRows" :activeIndex="activeRow" />
       
       <!-- Grid -->
       <div 
         class="grid" 
         :style="{ 
-          gridTemplateColumns: `repeat(${store.size}, var(--cell-size))`,
+          gridTemplateColumns: `repeat(${gridCols}, var(--cell-size))`,
-          gridTemplateRows: `repeat(${store.size}, var(--cell-size))`
+          gridTemplateRows: `repeat(${gridRows}, var(--cell-size))`
         }"
         @pointermove.prevent="handlePointerMove"
         @mouseleave="handleGridLeave"
@@ -231,8 +270,8 @@ watch(() => store.size, async () => {
             :r="r"
             :c="c"
             :class="{ 
-                'guide-right': (c + 1) % 5 === 0 && c !== store.size - 1,
+                'guide-right': (c + 1) % 5 === 0 && c !== gridCols - 1,
-                'guide-bottom': (r + 1) % 5 === 0 && r !== store.size - 1
+                'guide-bottom': (r + 1) % 5 === 0 && r !== gridRows - 1
             }"
             @start-drag="startDrag"
             @enter-cell="handleCellEnter"
@@ -272,6 +311,7 @@ watch(() => store.size, async () => {
     min-width: 100%;
     margin: 0 auto; /* Center the wrapper safely */
     align-items: flex-start; /* Prevent cropping when centered */
+    padding-right: 40px;
   }
   
   .game-container {

src/components/Hints.vue

@@ -32,7 +32,11 @@ defineProps({
       v-for="(group, index) in hints" 
       :key="index" 
       class="hint-group"
-      :class="{ 'is-active': index === activeIndex }"
+      :class="{
+        'is-active': index === activeIndex,
+        'guide-right': orientation === 'col' && (index + 1) % 5 === 0 && index !== size - 1,
+        'guide-bottom': orientation === 'row' && (index + 1) % 5 === 0 && index !== size - 1
+      }"
     >
       <span 
         v-for="(num, idx) in group" 
@@ -54,13 +58,13 @@ defineProps({
 
 .hints-container.col {
   padding-bottom: var(--grid-padding);
-  align-items: flex-end;
+  /* align-items: flex-end; - Removed to ensure uniform column height */
   padding-left: var(--grid-padding);
   padding-right: var(--grid-padding);
 }
 
 .hints-container.row {
-  align-items: flex-end;
+  /* align-items: flex-end; - Removed to ensure row hints fill the cell height */
   padding: var(--grid-padding) var(--grid-padding) var(--grid-padding) 0;
   width: max-content;
 }
@@ -95,6 +99,21 @@ defineProps({
   padding: 2px;
 }
 
+@media (max-width: 768px) {
+    .hint-num {
+        font-size: 0.7rem;
+        padding: 1px;
+    }
+    
+    .col .hint-group {
+        padding: 2px 0;
+    }
+    
+    .row .hint-group {
+        padding: 0 4px;
+    }
+}
+
 /* Alternating Colors within the group */
 .hint-num.hint-alt {
     color: var(--accent-cyan);
@@ -111,4 +130,12 @@ defineProps({
     border-color: rgba(79, 172, 254, 0.8);
     box-shadow: 0 0 12px rgba(79, 172, 254, 0.35);
 }
+
+/* Guide lines every 5 */
+.hint-group.guide-right {
+    border-right: 2px solid rgba(0, 242, 255, 0.5);
+}
+.hint-group.guide-bottom {
+    border-bottom: 2px solid rgba(0, 242, 255, 0.5);
+}
 </style>

src/components/ImageImportModal.vue

@@ -0,0 +1,859 @@
+<script setup>
+import { ref, computed, onMounted, onUnmounted, watch, nextTick } from 'vue';
+import { usePuzzleStore } from '@/stores/puzzle';
+import { useI18n } from '@/composables/useI18n';
+import { getWorkerPool } from '@/utils/workerPool';
+import { Upload, Image as ImageIcon, X, AlertTriangle, Camera, RefreshCw } from 'lucide-vue-next';
+
+const emit = defineEmits(['close']);
+const store = usePuzzleStore();
+const { t } = useI18n();
+
+const fileInput = ref(null);
+const canvasRef = ref(null);
+const previewCanvasRef = ref(null);
+const videoRef = ref(null);
+const isDragging = ref(false);
+const imageLoaded = ref(false);
+const processing = ref(false);
+const processingProgress = ref(0);
+const isCameraOpen = ref(false);
+const hasMultipleCameras = ref(false);
+const stream = ref(null);
+const facingMode = ref('environment');
+
+// Settings
+const maxDimension = ref(15);
+const threshold = ref(50); // 0-100% density
+
+// State
+const originalImage = ref(null);
+const generatedGrid = ref([]);
+const difficulty = ref(0);
+const solvability = ref(0);
+const difficultyLabel = ref('');
+const gridRows = ref(15);
+const gridCols = ref(15);
+
+const onDrop = (e) => {
+  isDragging.value = false;
+  const file = e.dataTransfer.files[0];
+  if (file && file.type.startsWith('image/')) {
+    processFile(file);
+  }
+};
+
+const onFileSelect = (e) => {
+  const file = e.target.files[0];
+  if (file) {
+    processFile(file);
+  }
+};
+
+const processFile = (file) => {
+  const reader = new FileReader();
+  reader.onload = (e) => {
+    const img = new Image();
+    img.onload = () => {
+      originalImage.value = img;
+      imageLoaded.value = true;
+      nextTick(() => {
+        updateGrid();
+      });
+    };
+    img.src = e.target.result;
+  };
+  reader.readAsDataURL(file);
+};
+
+const updateGrid = () => {
+  if (!originalImage.value || !canvasRef.value) return;
+
+  const ctx = canvasRef.value.getContext('2d');
+  
+  // Calculate dimensions preserving aspect ratio
+  const imgW = originalImage.value.width;
+  const imgH = originalImage.value.height;
+  const aspect = imgW / imgH;
+  
+  let w, h;
+  const maxDim = maxDimension.value;
+
+  if (aspect >= 1) {
+      w = maxDim;
+      h = Math.round(w / aspect);
+  } else {
+      h = maxDim;
+      w = Math.round(h * aspect);
+  }
+
+  // Ensure bounds [5, 80]
+  // 1. Clamp min (prioritize min 5)
+  if (w < 5) { w = 5; h = Math.round(w / aspect); }
+  if (h < 5) { h = 5; w = Math.round(h * aspect); }
+  
+  // 2. Clamp max (hard limit 80)
+  if (w > 80) w = 80;
+  if (h > 80) h = 80;
+  
+  // Final safeguard
+  w = Math.max(5, Math.min(80, Math.round(w)));
+  h = Math.max(5, Math.min(80, Math.round(h)));
+
+  gridRows.value = h;
+  gridCols.value = w;
+
+  // Resize logic
+  canvasRef.value.width = w;
+  canvasRef.value.height = h;
+  
+  // Draw image scaled to grid size
+  ctx.drawImage(originalImage.value, 0, 0, w, h);
+  
+  // Get pixel data
+  const imageData = ctx.getImageData(0, 0, w, h);
+  const data = imageData.data;
+  
+  // 1. Collect brightness of valid pixels
+  const pixels = [];
+  for (let y = 0; y < h; y++) {
+    for (let x = 0; x < w; x++) {
+      const i = (y * w + x) * 4;
+      const r = data[i];
+      const g = data[i + 1];
+      const b = data[i + 2];
+      const a = data[i + 3];
+      
+      // If transparent, ignore
+      if (a >= 128) {
+        // Calculate brightness (Luminance)
+        const brightness = 0.299 * r + 0.587 * g + 0.114 * b;
+        pixels.push({ x, y, brightness });
+      }
+    }
+  }
+
+  // 2. Sort by brightness (ascending: dark -> light)
+  // Darker pixels have lower brightness.
+  // We want to fill the darkest X% pixels.
+  pixels.sort((a, b) => a.brightness - b.brightness);
+
+  // 3. Determine cutoff
+  // threshold.value is density (0-100%)
+  // If density is 50%, we want 50% of pixels to be black.
+  // So we take the first 50% of sorted pixels.
+  const totalValid = pixels.length;
+  const targetFillCount = Math.floor(totalValid * (threshold.value / 100));
+
+  // 4. Build grid
+  const grid = Array(h).fill().map(() => Array(w).fill(0));
+  
+  // Mark the darkest pixels as filled (1)
+  for (let i = 0; i < targetFillCount; i++) {
+    const p = pixels[i];
+    grid[p.y][p.x] = 1;
+  }
+  
+  generatedGrid.value = grid;
+  drawPreview();
+  calculateStats();
+};
+
+const drawPreview = () => {
+    if (!previewCanvasRef.value || generatedGrid.value.length === 0) return;
+    const ctx = previewCanvasRef.value.getContext('2d');
+    const rows = generatedGrid.value.length;
+    const cols = generatedGrid.value[0].length;
+    
+    // Max 300px width/height, preserving aspect
+    const maxPreview = 300;
+    const cellW = maxPreview / Math.max(rows, cols);
+    const cellH = cellW; // square cells
+    
+    const previewW = cols * cellW;
+    const previewH = rows * cellH;
+    
+    previewCanvasRef.value.width = previewW;
+    previewCanvasRef.value.height = previewH;
+    
+    ctx.clearRect(0, 0, previewW, previewH);
+    
+    // Draw original image with low opacity
+    if (originalImage.value) {
+        ctx.save();
+        ctx.globalAlpha = 0.3;
+        ctx.drawImage(originalImage.value, 0, 0, previewW, previewH);
+        ctx.restore();
+    }
+    
+    for (let y = 0; y < rows; y++) {
+        for (let x = 0; x < cols; x++) {
+            if (generatedGrid.value[y][x] === 1) {
+                ctx.fillStyle = '#000';
+                ctx.fillRect(x * cellW, y * cellH, cellW, cellH);
+            }
+        }
+    }
+    
+    // Grid lines
+    ctx.strokeStyle = '#ccc';
+    ctx.lineWidth = 0.5;
+    
+    // Vertical lines
+    for (let i = 0; i <= cols; i++) {
+        ctx.beginPath();
+        ctx.moveTo(i * cellW, 0);
+        ctx.lineTo(i * cellW, previewH);
+        ctx.stroke();
+    }
+    
+    // Horizontal lines
+    for (let i = 0; i <= rows; i++) {
+        ctx.beginPath();
+        ctx.moveTo(0, i * cellH);
+        ctx.lineTo(previewW, i * cellH);
+        ctx.stroke();
+    }
+};
+
+const calculateStats = async () => {
+    if (generatedGrid.value.length === 0) return;
+    
+    processing.value = true;
+    processingProgress.value = 0;
+    const requestId = Date.now();
+    currentStatsRequestId = requestId;
+    
+    try {
+        const pool = getWorkerPool();
+        pool.cancelAll(); // Force stop previous calculations for immediate responsiveness
+        
+        // Demonstrate parallel execution capability
+        // We split the problem into two branches: assuming first cell is EMPTY (0) vs FILLED (1)
+        // This doubles the search power by utilizing 2 workers immediately.
+        
+        // Ensure we send plain objects to workers, not Vue proxies
+        const rawGrid = JSON.parse(JSON.stringify(generatedGrid.value));
+        const rows = rawGrid.length;
+        const cols = rawGrid[0].length;
+        
+        // Create initial states
+        const gridA = Array(rows).fill().map(() => Array(cols).fill(-1));
+        gridA[0][0] = 0; // Branch A: Assume (0,0) is Empty
+        
+        const gridB = Array(rows).fill().map(() => Array(cols).fill(-1));
+        gridB[0][0] = 1; // Branch B: Assume (0,0) is Filled
+        
+        const tasks = [
+            {
+                data: { id: requestId, grid: rawGrid, initialGrid: gridA },
+                onProgress: (p) => { if (currentStatsRequestId === requestId) processingProgress.value = Math.max(processingProgress.value, p); }
+            },
+            {
+                data: { id: requestId, grid: rawGrid, initialGrid: gridB },
+                onProgress: (p) => { if (currentStatsRequestId === requestId) processingProgress.value = Math.max(processingProgress.value, p); }
+            }
+        ];
+
+        const result = await pool.runRace(tasks);
+        
+        if (result.id === currentStatsRequestId) {
+            solvability.value = result.solvability;
+            difficulty.value = result.difficulty;
+            difficultyLabel.value = result.difficultyLabel;
+        }
+    } catch (err) {
+        if (err.message !== 'Cancelled' && err.message !== 'Terminated') {
+            console.error('Worker error:', err);
+            if (currentStatsRequestId === requestId) {
+                solvability.value = 0;
+                difficulty.value = 0;
+                // If translation key is missing, this might show 'difficulty.error'
+                // Ensure we have a fallback or the key exists
+                difficultyLabel.value = 'error'; 
+            }
+        }
+    } finally {
+        if (currentStatsRequestId === requestId) {
+            processing.value = false;
+        }
+    }
+};
+
+let currentStatsRequestId = 0;
+
+let debounceTimer;
+watch([maxDimension, threshold], () => {
+    if (imageLoaded.value) {
+        if (debounceTimer) clearTimeout(debounceTimer);
+        debounceTimer = setTimeout(() => {
+            updateGrid();
+        }, 50);
+    } else {
+        // If no image loaded, just update the display values
+        // Assuming square aspect ratio for preview
+        gridRows.value = maxDimension.value;
+        gridCols.value = maxDimension.value;
+    }
+});
+
+const createPuzzle = () => {
+    if (generatedGrid.value.length > 0) {
+        store.initFromImage(generatedGrid.value);
+        emit('close');
+    }
+};
+
+const triggerFileInput = () => {
+    fileInput.value.click();
+};
+
+const startCamera = async () => {
+    isCameraOpen.value = true;
+    try {
+        if (stream.value) {
+            stopCameraStream();
+        }
+        const constraints = {
+            video: {
+                facingMode: facingMode.value
+            }
+        };
+        stream.value = await navigator.mediaDevices.getUserMedia(constraints);
+
+        // Check available devices
+        const devices = await navigator.mediaDevices.enumerateDevices();
+        const videoDevices = devices.filter(device => device.kind === 'videoinput');
+        hasMultipleCameras.value = videoDevices.length > 1;
+
+        // Wait for next tick or ensure videoRef is available
+        setTimeout(() => {
+            if (videoRef.value) {
+                videoRef.value.srcObject = stream.value;
+            }
+        }, 100);
+    } catch (err) {
+        console.error("Error accessing camera:", err);
+        alert(t('image.cameraError'));
+        isCameraOpen.value = false;
+    }
+};
+
+const stopCameraStream = () => {
+    if (stream.value) {
+        stream.value.getTracks().forEach(track => track.stop());
+        stream.value = null;
+    }
+};
+
+const closeCamera = () => {
+    stopCameraStream();
+    isCameraOpen.value = false;
+};
+
+const switchCamera = async () => {
+    facingMode.value = facingMode.value === 'user' ? 'environment' : 'user';
+    await startCamera();
+};
+
+const capturePhoto = () => {
+    if (!videoRef.value) return;
+    
+    const canvas = document.createElement('canvas');
+    canvas.width = videoRef.value.videoWidth;
+    canvas.height = videoRef.value.videoHeight;
+    const ctx = canvas.getContext('2d');
+    
+    // Mirror if using front camera
+    if (facingMode.value === 'user') {
+        ctx.translate(canvas.width, 0);
+        ctx.scale(-1, 1);
+    }
+    
+    ctx.drawImage(videoRef.value, 0, 0, canvas.width, canvas.height);
+    
+    const img = new Image();
+    img.onload = () => {
+        originalImage.value = img;
+        imageLoaded.value = true;
+        nextTick(() => {
+            updateGrid();
+        });
+        closeCamera();
+    };
+    img.src = canvas.toDataURL('image/png');
+};
+
+onUnmounted(() => {
+    stopCameraStream();
+});
+
+</script>
+
+<template>
+  <div class="modal-overlay" @click.self="$emit('close')">
+    <div class="modal-content">
+      <button class="close-btn" @click="$emit('close')">
+        <X :size="24" />
+      </button>
+      
+      <h2 class="modal-title">{{ t('image.title') }}</h2>
+      
+      <div v-if="isCameraOpen" class="camera-overlay">
+        <video ref="videoRef" autoplay playsinline></video>
+        <div class="camera-controls">
+            <button class="camera-btn secondary" @click="closeCamera">
+                <X :size="24" />
+            </button>
+            <button class="camera-btn capture" @click="capturePhoto">
+                <div class="shutter"></div>
+            </button>
+            <button v-if="hasMultipleCameras" class="camera-btn secondary" @click="switchCamera">
+                <RefreshCw :size="24" />
+            </button>
+        </div>
+      </div>
+
+      <div class="content-grid">
+        <!-- Left: Input & Preview -->
+        <div class="input-section">
+            <div 
+                class="drop-zone"
+                :class="{ dragging: isDragging, loaded: imageLoaded }"
+                @dragover.prevent="isDragging = true"
+                @dragleave.prevent="isDragging = false"
+                @drop.prevent="onDrop"
+                @click="!imageLoaded ? triggerFileInput() : null"
+            >
+                <input 
+                    ref="fileInput"
+                    type="file" 
+                    accept="image/*" 
+                    class="hidden-input"
+                    @change="onFileSelect"
+                />
+                
+                <div v-if="!imageLoaded" class="placeholder">
+                    <Upload :size="48" class="icon" />
+                    <p>{{ t('image.drop') }}</p>
+                    <div class="button-group">
+                        <button class="btn-neon small" @click.stop="triggerFileInput">
+                            {{ t('image.select') }}
+                        </button>
+                        <button class="btn-neon small secondary" @click.stop="startCamera">
+                            <Camera :size="16" />
+                            {{ t('image.camera') }}
+                        </button>
+                    </div>
+                </div>
+                
+                <div v-else class="preview-container">
+                    <canvas ref="previewCanvasRef" class="preview-canvas"></canvas>
+                    <div class="button-group">
+                        <button class="btn-change" @click.stop="triggerFileInput">
+                            {{ t('image.change') }}
+                        </button>
+                        <button class="btn-change" @click.stop="startCamera">
+                            <Camera :size="16" />
+                        </button>
+                    </div>
+                </div>
+            </div>
+            
+            <!-- Hidden canvas for processing -->
+            <canvas ref="canvasRef" style="display: none;"></canvas>
+        </div>
+        
+        <!-- Right: Controls & Stats -->
+        <div class="controls-section">
+            <div class="control-group">
+                <label>{{ t('image.size') }}: {{ gridCols }}x{{ gridRows }}</label>
+                <input 
+                    type="range" 
+                    v-model.number="maxDimension" 
+                    min="5" 
+                    max="80" 
+                    step="5"
+                />
+            </div>
+            
+            <div class="control-group">
+                <label>{{ t('image.threshold') }}: {{ threshold }}%</label>
+                <input 
+                    type="range" 
+                    v-model.number="threshold" 
+                    min="1" 
+                    max="99" 
+                />
+                <div class="threshold-preview">
+                    <span>Low Density</span>
+                    <span>High Density</span>
+                </div>
+            </div>
+            
+            <div v-if="imageLoaded" class="stats-panel">
+                <div v-if="processing" class="loading-stats">
+                    <div class="spinner"></div>
+                    <span>{{ t('image.calculatingSolvability') || 'Calculating solvability...' }} {{ processingProgress }}%</span>
+                </div>
+                <template v-else>
+                    <div class="stat-row">
+                        <span>{{ t('image.solvability') }}:</span>
+                        <span :class="{ 'good': solvability === 100, 'bad': solvability < 100 }">
+                            {{ solvability }}%
+                        </span>
+                    </div>
+                    <div v-if="solvability < 100" class="warning">
+                        <AlertTriangle :size="16" />
+                        {{ t('image.warning') }}
+                    </div>
+                    
+                    <div class="stat-row">
+                        <span>{{ t('image.difficulty') }}:</span>
+                        <span>{{ difficulty }}% ({{ t(`difficulty.${difficultyLabel.toLowerCase()}`) }})</span>
+                    </div>
+                </template>
+            </div>
+            
+            <div class="actions">
+                <button 
+                    class="btn-neon primary" 
+                    :disabled="!imageLoaded || processing"
+                    @click="createPuzzle"
+                >
+                    {{ t('image.create') }}
+                </button>
+            </div>
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.loading-stats {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    gap: 10px;
+    padding: 10px;
+    color: var(--text-muted);
+}
+
+.spinner {
+    width: 20px;
+    height: 20px;
+    border: 2px solid var(--text-muted);
+    border-top-color: var(--primary-accent);
+    border-radius: 50%;
+    animation: spin 1s linear infinite;
+}
+
+@keyframes spin {
+    to { transform: rotate(360deg); }
+}
+
+.modal-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100vw;
+  height: 100vh;
+  background: rgba(0, 0, 0, 0.7);
+  backdrop-filter: blur(5px);
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  z-index: 1000;
+}
+
+.modal-content {
+  background: var(--panel-bg);
+  border: 1px solid var(--border-color);
+  border-radius: 16px;
+  padding: 30px;
+  width: 90%;
+  max-width: 800px;
+  position: relative;
+  box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
+  color: var(--text-color);
+  max-height: 90vh;
+  overflow-y: auto;
+}
+
+.close-btn {
+  position: absolute;
+  top: 15px;
+  right: 15px;
+  background: none;
+  border: none;
+  color: var(--text-muted);
+  cursor: pointer;
+  transition: color 0.3s;
+}
+
+.close-btn:hover {
+  color: var(--text-color);
+}
+
+.modal-title {
+  text-align: center;
+  margin-bottom: 30px;
+  color: var(--primary-accent);
+  font-size: 1.8rem;
+  text-shadow: 0 0 10px var(--primary-accent);
+}
+
+.camera-overlay {
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background: #000;
+    z-index: 10;
+    display: flex;
+    flex-direction: column;
+    overflow: hidden;
+    border-radius: 16px;
+}
+
+.camera-overlay video {
+    width: 100%;
+    height: 100%;
+    object-fit: cover;
+}
+
+.camera-controls {
+    position: absolute;
+    bottom: 20px;
+    left: 0;
+    width: 100%;
+    display: flex;
+    justify-content: space-around;
+    align-items: center;
+    padding: 20px;
+    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
+}
+
+.camera-btn {
+    background: none;
+    border: none;
+    color: white;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    width: 50px;
+    height: 50px;
+    border-radius: 50%;
+    background: rgba(255,255,255,0.2);
+    backdrop-filter: blur(5px);
+}
+
+.camera-btn.capture {
+    width: 70px;
+    height: 70px;
+    background: rgba(255,255,255,0.3);
+    border: 4px solid white;
+}
+
+.shutter {
+    width: 54px;
+    height: 54px;
+    background: white;
+    border-radius: 50%;
+    transition: transform 0.1s;
+}
+
+.camera-btn.capture:active .shutter {
+    transform: scale(0.9);
+}
+
+.button-group {
+    display: flex;
+    gap: 10px;
+    margin-top: 15px;
+    justify-content: center;
+}
+
+.content-grid {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 30px;
+}
+
+@media (max-width: 768px) {
+    .content-grid {
+        grid-template-columns: 1fr;
+    }
+}
+
+.drop-zone {
+    border: 2px dashed var(--border-color);
+    border-radius: 12px;
+    height: 300px;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    flex-direction: column;
+    cursor: pointer;
+    transition: all 0.3s;
+    background: rgba(255, 255, 255, 0.05);
+}
+
+.drop-zone:hover, .drop-zone.dragging {
+    border-color: var(--primary-accent);
+    background: rgba(0, 242, 254, 0.1);
+}
+
+.drop-zone.loaded {
+    border: none;
+    background: none;
+    cursor: default;
+}
+
+.placeholder {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    gap: 15px;
+    color: var(--text-muted);
+}
+
+.hidden-input {
+    display: none;
+}
+
+.preview-container {
+    position: relative;
+    width: 300px;
+    height: 300px;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+}
+
+.preview-container .button-group {
+    position: absolute;
+    bottom: 10px;
+    right: 10px;
+    display: flex;
+    gap: 8px;
+    margin: 0;
+}
+
+.preview-canvas {
+    max-width: 100%;
+    max-height: 100%;
+    border: 1px solid var(--border-color);
+    box-shadow: 0 0 15px rgba(0,0,0,0.3);
+}
+
+.btn-change {
+    background: rgba(0,0,0,0.7);
+    color: white;
+    border: 1px solid white;
+    padding: 5px 10px;
+    border-radius: 4px;
+    cursor: pointer;
+    font-size: 0.8rem;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    backdrop-filter: blur(2px);
+    transition: background 0.2s;
+}
+
+.btn-change:hover {
+    background: rgba(0,0,0,0.9);
+}
+
+.controls-section {
+    display: flex;
+    flex-direction: column;
+    gap: 20px;
+}
+
+.control-group {
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+}
+
+input[type="range"] {
+    width: 100%;
+    accent-color: var(--primary-accent);
+}
+
+.threshold-preview {
+    display: flex;
+    justify-content: space-between;
+    font-size: 0.8rem;
+    color: var(--text-muted);
+}
+
+.stats-panel {
+    background: rgba(0,0,0,0.2);
+    padding: 15px;
+    border-radius: 8px;
+    border: 1px solid var(--border-color);
+}
+
+.stat-row {
+    display: flex;
+    justify-content: space-between;
+    margin-bottom: 8px;
+    font-size: 1.1rem;
+}
+
+.good { color: #4ade80; }
+.bad { color: #f87171; }
+
+.warning {
+    color: #fbbf24;
+    font-size: 0.85rem;
+    display: flex;
+    align-items: center;
+    gap: 5px;
+    margin-top: -5px;
+    margin-bottom: 10px;
+}
+
+.actions {
+    margin-top: auto;
+    display: flex;
+    justify-content: center;
+}
+
+.btn-neon {
+  padding: 10px 20px;
+  border: 1px solid var(--primary-accent);
+  background: rgba(0, 242, 254, 0.1);
+  color: var(--primary-accent);
+  font-family: 'Orbitron', sans-serif;
+  text-transform: uppercase;
+  cursor: pointer;
+  transition: all 0.3s ease;
+  box-shadow: 0 0 10px rgba(0, 242, 254, 0.2);
+  border-radius: 4px;
+}
+
+.btn-neon:hover:not(:disabled) {
+  background: var(--primary-accent);
+  color: #000;
+  box-shadow: 0 0 20px var(--primary-accent);
+}
+
+.btn-neon:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+    filter: grayscale(1);
+}
+
+.btn-neon.small {
+    padding: 5px 15px;
+    font-size: 0.8rem;
+}
+
+</style>

src/components/NavBar.vue

@@ -2,12 +2,12 @@
 import { ref, computed, onMounted, onUnmounted, watch } from 'vue';
 import { usePuzzleStore } from '@/stores/puzzle';
 import { useI18n } from '@/composables/useI18n';
-import { Gamepad2, Palette, CircleHelp, Sun, Moon, Menu, X, ChevronDown, ChevronUp, Monitor } from 'lucide-vue-next';
+import { Gamepad2, Palette, CircleHelp, Sun, Moon, Menu, X, ChevronDown, ChevronUp, Monitor, Image as ImageIcon, Sparkles, Shuffle, Grid3X3, Grid2X2, Grid, MousePointer2 } from 'lucide-vue-next';
 
 const store = usePuzzleStore();
 const { t, locale, setLocale, locales } = useI18n();
 
-const emit = defineEmits(['open-custom', 'toggle-guide', 'set-theme']);
+const emit = defineEmits(['open-custom', 'open-image-import', 'toggle-guide', 'set-theme']);
 
 const isGameOpen = ref(false);
 const isThemeOpen = ref(false);
@@ -16,6 +16,13 @@ const isMobileMenuOpen = ref(false);
 const langMenuRef = ref(null);
 const searchTerm = ref('');
 
+const getLevelIcon = (id) => {
+  if (id === 'easy') return Grid2X2;
+  if (id === 'medium') return Grid3X3;
+  if (id === 'hard') return Grid;
+  return Gamepad2;
+};
+
 // Map language codes to country codes for flag-icons
 const langToCountry = {
   en: 'gb',
@@ -180,6 +187,12 @@ const openCustom = () => {
   closeMobileMenu();
 };
 
+const openImageImport = () => {
+  emit('open-image-import');
+  isGameOpen.value = false;
+  closeMobileMenu();
+};
+
 const setTheme = (theme) => {
   emit('set-theme', theme);
   isThemeOpen.value = false;
@@ -251,10 +264,16 @@ watch(isMobileMenuOpen, (val) => {
               class="dropdown-item"
               @click="selectLevel(lvl.id)"
             >
+              <component :is="getLevelIcon(lvl.id)" :size="16" />
               {{ lvl.label }}
             </button>
             <button class="dropdown-item" @click="openCustom">
-              {{ t('level.custom') }}
+              <Shuffle :size="16" />
+              {{ t('level.custom_random') }}
+            </button>
+            <button class="dropdown-item" @click="openImageImport">
+              <ImageIcon :size="16" />
+              {{ t('level.custom_image') }}
             </button>
           </div>
         </transition>
@@ -321,8 +340,10 @@ watch(isMobileMenuOpen, (val) => {
         </transition>
       </div>
     </div>
+  </nav>
 
-    <!-- Mobile Menu Overlay -->
+  <!-- Mobile Menu Overlay -->
+  <Teleport to="body">
     <transition name="fade">
         <div v-if="isMobileMenuOpen" class="mobile-menu-overlay">
             <div class="mobile-menu-header">
@@ -346,10 +367,16 @@ watch(isMobileMenuOpen, (val) => {
                             class="mobile-sub-item"
                             @click="selectLevel(lvl.id)"
                           >
+                            <component :is="getLevelIcon(lvl.id)" :size="16" />
                             {{ lvl.label }}
                           </button>
                           <button class="mobile-sub-item" @click="openCustom">
-                            {{ t('level.custom') }}
+                            <Shuffle :size="16" />
+                            {{ t('level.custom_random') }}
+                          </button>
+                          <button class="mobile-sub-item" @click="openImageImport">
+                            <ImageIcon :size="16" />
+                            {{ t('level.custom_image') }}
                           </button>
                     </div>
                 </div>
@@ -402,7 +429,7 @@ watch(isMobileMenuOpen, (val) => {
                               />
                          </div>
                         <div class="lang-list mobile-lang-list">
-                             <button
+                              <button
                                 v-for="lang in filteredLanguages"
                                 :key="lang.code"
                                 class="mobile-sub-item"
@@ -420,7 +447,7 @@ watch(isMobileMenuOpen, (val) => {
             </div>
         </div>
     </transition>
-  </nav>
+  </Teleport>
 </template>
 
 <style scoped>

src/components/SimulationView.vue

@@ -9,9 +9,9 @@ import { X, Play, Square, RotateCcw } from 'lucide-vue-next';
 const emit = defineEmits(['close']);
 const { t } = useI18n();
 
-const SIZES = [5, 10, 15, 20, 25, 30, 35, 40, 45, 50]; 
+const SIZES = [5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80]; 
 const DENSITIES = [0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9];
-const SAMPLES_PER_POINT = 10; // Reduced for web performance demo
+const SAMPLES_PER_POINT = 50; // Increased for better accuracy
 
 const isRunning = ref(false);
 const progress = ref(0);
@@ -71,11 +71,12 @@ const startSimulation = async () => {
             for (let i = 0; i < SAMPLES_PER_POINT; i++) {
                 const grid = generateRandomGrid(size, density);
                 const { rowHints, colHints } = calculateHints(grid);
-                const { percentSolved } = solvePuzzle(rowHints, colHints);
+                // Use logicOnly=true for fast simulation
+                const { percentSolved } = solvePuzzle(rowHints, colHints, null, null, true);
                 totalSolved += percentSolved;
                 
                 // Yield to UI every few samples to keep it responsive
-                if (i % 2 === 0) await new Promise(r => setTimeout(r, 0));
+                if (i % 10 === 0) await new Promise(r => setTimeout(r, 0));
             }
 
             const avgSolved = totalSolved / SAMPLES_PER_POINT;

src/components/WinModal.vue

@@ -215,6 +215,8 @@ onUnmounted(() => {
   width: fit-content;
   max-width: min(92vw, 560px);
   min-width: 280px;
+  max-height: 90vh;
+  overflow-y: auto;
   border: 1px solid var(--primary-accent);
   box-shadow: 0 0 50px rgba(0, 242, 255, 0.2);
   animation: slideUp 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
@@ -223,6 +225,12 @@ onUnmounted(() => {
   overflow-wrap: anywhere;
 }
 
+@media (max-width: 768px), (max-height: 600px) {
+  .modal {
+    padding: 20px;
+  }
+}
+
 h2 {
   font-size: 2.5rem;
   color: var(--primary-accent);

src/composables/useSolver.js

@@ -9,8 +9,8 @@ export function useSolver() {
     const isPlaying = ref(false);
     const isProcessing = ref(false);
     const speedIndex = ref(0);
-    const speeds = [1000, 500, 250, 125, 62];
+    const speeds = [1000, 500, 250, 125, 62, 31, 16];
-    const speedLabels = ['x1', 'x2', 'x4', 'x8', 'x16'];
+    const speedLabels = ['x1', 'x2', 'x4', 'x8', 'x16', 'x32', 'x64'];
     const statusText = ref(t('guide.waiting'));
     
     let intervalId = null;

src/stores/puzzle.js

@@ -32,12 +32,15 @@ export const usePuzzleStore = defineStore('puzzle', () => {
     let count = 0;
     if (solution.value.length === 0 || playerGrid.value.length === 0) return 0;
     
-    for (let r = 0; r < size.value; r++) {
+    const rows = solution.value.length;
-      for (let c = 0; c < size.value; c++) {
+    const cols = solution.value[0].length;
+    
+    for (let r = 0; r < rows; r++) {
+      for (let c = 0; c < cols; c++) {
         // Zliczamy tylko poprawne wypełnienia (czarne), 
         // ale w nonogramach postęp to często: (poprawne_czarne - bledne_czarne) / total_czarne
         // Zróbmy prostą wersję: % poprawnie zaznaczonych czarnych - błędnie zaznaczone czarne
-        if (playerGrid.value[r][c] === 1) {
+        if (playerGrid.value[r] && playerGrid.value[r][c] === 1) {
             if (solution.value[r][c] === 1) count++;
             else count--; // kara za błąd
         }
@@ -93,10 +96,36 @@ export const usePuzzleStore = defineStore('puzzle', () => {
     saveState();
   }
 
+  function initFromImage(grid) {
+    stopTimer();
+    currentLevelId.value = 'custom_image';
+    // Use the larger dimension for size to ensure loops cover everything if square-assumption exists
+    // But ideally we should support rectangular.
+    // For now, size.value is used in resetGrid loop.
+    // Let's update resetGrid to handle rectangular.
+    size.value = Math.max(grid.length, grid[0].length);
+    solution.value = grid;
+    
+    resetGrid();
+    isGameWon.value = false;
+    hasUsedGuide.value = false;
+    guideUsageCount.value = 0;
+    
+    // Calculate density
+    const totalFilled = grid.flat().filter(c => c === 1).length;
+    currentDensity.value = totalFilled / (size.value * size.value);
+    
+    elapsedTime.value = 0;
+    startTimer();
+    saveState();
+  }
+
   function resetGrid() {
-    playerGrid.value = Array(size.value).fill().map(() => Array(size.value).fill(0));
+    const rows = solution.value.length;
-    moves.value = 0;
+    const cols = solution.value[0].length;
+    playerGrid.value = Array(rows).fill().map(() => Array(cols).fill(0));
     history.value = [];
+    moves.value = 0;
     currentTransaction.value = null;
   }
   
@@ -198,11 +227,14 @@ export const usePuzzleStore = defineStore('puzzle', () => {
     
     // Calculate expected hints from solution (truth)
     // We do this dynamically to ensure we always check against the rules of the board
+    const rows = solution.value.length;
+    const cols = solution.value[0].length;
+    
     const solutionRows = solution.value;
-    const solutionCols = Array(size.value).fill().map((_, c) => solution.value.map(r => r[c]));
+    const solutionCols = Array(cols).fill().map((_, c) => solution.value.map(r => r[c]));
     
     // Check Rows
-    for (let r = 0; r < size.value; r++) {
+    for (let r = 0; r < rows; r++) {
       const targetHints = calculateLineHints(solutionRows[r]);
       const playerLine = playerGrid.value[r];
       if (!validateLine(playerLine, targetHints)) {
@@ -213,7 +245,7 @@ export const usePuzzleStore = defineStore('puzzle', () => {
     
     if (correct) {
       // Check Columns
-      for (let c = 0; c < size.value; c++) {
+      for (let c = 0; c < cols; c++) {
         const targetHints = calculateLineHints(solutionCols[c]);
         const playerLine = playerGrid.value.map(row => row[c]);
         if (!validateLine(playerLine, targetHints)) {
@@ -332,6 +364,7 @@ export const usePuzzleStore = defineStore('puzzle', () => {
     progressPercentage,
     initGame,
     initCustomGame,
+    initFromImage,
     toggleCell,
     setCell,
     resetGame,

src/utils/debug_solver.test.js

@@ -0,0 +1,27 @@
+
+import { describe, it, expect } from 'vitest';
+import { solvePuzzle } from './solver';
+import { calculateHints } from './puzzleUtils';
+
+describe('Debug Solver', () => {
+    it('should solve the broken grid', () => {
+        const grid = [
+            [0,1,1,1,0,0,1,0,1,1],
+            [1,1,1,0,0,1,1,1,0,0],
+            [1,0,1,0,1,0,0,1,0,0],
+            [1,0,0,0,1,1,1,1,0,1],
+            [1,1,0,1,0,0,0,1,0,1],
+            [1,0,1,0,1,0,0,0,1,0],
+            [1,1,1,0,0,1,1,0,0,0],
+            [0,1,0,0,1,0,1,0,0,0],
+            [0,0,0,1,1,0,0,0,1,0],
+            [1,0,1,1,0,0,1,0,1,1]
+        ];
+
+        const { rowHints, colHints } = calculateHints(grid);
+        const result = solvePuzzle(rowHints, colHints);
+        
+        console.log('Solve Result:', result);
+        expect(result.percentSolved).toBe(100);
+    });
+});

src/utils/large_grid_solver.test.js

@@ -0,0 +1,44 @@
+
+import { describe, it, expect } from 'vitest';
+import { solvePuzzle } from './solver.js';
+
+describe('Large Grid Solver', () => {
+    it('should solve a large 55x28 grid without crashing', () => {
+        const rows = 28;
+        const cols = 55;
+        // Create a simple pattern: checkerboard or lines
+        const grid = Array(rows).fill().map((_, r) => 
+            Array(cols).fill().map((_, c) => (r + c) % 2 === 0 ? 1 : 0)
+        );
+        
+        // Calculate hints
+        const rowHints = grid.map(row => {
+            const hints = [];
+            let current = 0;
+            row.forEach(cell => {
+                if (cell === 1) current++;
+                else if (current > 0) { hints.push(current); current = 0; }
+            });
+            if (current > 0) hints.push(current);
+            return hints.length ? hints : [0];
+        });
+        
+        const colHints = Array(cols).fill().map((_, c) => {
+            const hints = [];
+            let current = 0;
+            for(let r=0; r<rows; r++) {
+                if (grid[r][c] === 1) current++;
+                else if (current > 0) { hints.push(current); current = 0; }
+            }
+            if (current > 0) hints.push(current);
+            return hints.length ? hints : [0];
+        });
+        
+        console.log('Starting solve...');
+        const result = solvePuzzle(rowHints, colHints, (p) => console.log(`Progress: ${p}%`));
+        console.log('Result:', result);
+        
+        expect(result.percentSolved).toBeGreaterThan(0);
+        expect(result.difficulty).toBeDefined();
+    });
+});

src/utils/puzzleUtils.js

@@ -27,19 +27,20 @@ export function validateLine(line, targetHints) {
 export function calculateHints(grid) {
     if (!grid || grid.length === 0) return { rowHints: [], colHints: [] };
     
-    const size = grid.length;
+    const rows = grid.length;
+    const cols = grid[0].length;
     const rowHints = [];
     const colHints = [];
 
     // Row Hints
-    for (let r = 0; r < size; r++) {
+    for (let r = 0; r < rows; r++) {
         rowHints.push(calculateLineHints(grid[r]));
     }
 
     // Col Hints
-    for (let c = 0; c < size; c++) {
+    for (let c = 0; c < cols; c++) {
         const col = [];
-        for (let r = 0; r < size; r++) {
+        for (let r = 0; r < rows; r++) {
             col.push(grid[r][c]);
         }
         colHints.push(calculateLineHints(col));
@@ -63,21 +64,23 @@ export function generateRandomGrid(size, density = 0.5) {
 export function calculateDifficulty(density, size = 10) {
     // Data derived from Monte Carlo Simulation (Logical Solver)
     // Format: { size: [solved_pct_at_0.1, ..., solved_pct_at_0.9] }
-    // Densities: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9
     const SIM_DATA = {
-        5:  [89, 74, 74, 81, 97, 98, 99, 100, 100],
+        5: [88, 76, 71, 80, 90, 98, 99, 100, 100],
-        10: [57, 20, 16, 54, 92, 100, 100, 100, 100],
+        10: [58, 25, 18, 44, 81, 99, 100, 100, 100],
-        15: [37, 10, 2, 12, 68, 100, 100, 100, 100],
+        15: [36, 7, 3, 11, 67, 99, 100, 100, 100],
-        20: [23, 3, 1, 2, 37, 100, 100, 100, 100],
+        20: [24, 3, 0, 3, 48, 99, 100, 100, 100],
-        25: [16, 0, 0, 1, 19, 99, 100, 100, 100],
+        25: [13, 1, 0, 1, 21, 99, 100, 100, 100],
-        30: [8, 0, 0, 0, 5, 99, 100, 100, 100],
+        30: [9, 0, 0, 0, 7, 99, 100, 100, 100],
-        35: [6, 0, 0, 0, 4, 91, 100, 100, 100],
+        35: [5, 0, 0, 0, 5, 97, 100, 100, 100],
         40: [3, 0, 0, 0, 2, 91, 100, 100, 100],
-        45: [2, 0, 0, 0, 1, 82, 100, 100, 100],
+        45: [2, 0, 0, 0, 1, 84, 100, 100, 100],
-        50: [2, 0, 0, 0, 1, 73, 100, 100, 100],
+        50: [1, 0, 0, 0, 0, 65, 100, 100, 100],
+        55: [1, 0, 0, 0, 0, 55, 100, 100, 100],
         60: [0, 0, 0, 0, 0, 35, 100, 100, 100],
-        71: [0, 0, 0, 0, 0, 16, 100, 100, 100],
+        65: [0, 0, 0, 0, 0, 20, 100, 100, 100],
-        80: [0, 0, 0, 0, 0, 1, 100, 100, 100]
+        70: [0, 0, 0, 0, 0, 11, 100, 100, 100],
+        75: [0, 0, 0, 0, 0, 12, 100, 100, 100],
+        80: [0, 0, 0, 0, 0, 4, 100, 100, 100]
     };
 
     // Helper to get interpolated value from array
@@ -122,17 +125,41 @@ export function calculateDifficulty(density, size = 10) {
 
     const solvedPct = getSimulatedSolvedPct(size, density);
     
-    // Difficulty Score: Inverse of Solved Percent
+    let value;
-    // 100% Solved -> 0 Difficulty
+    let level;
-    // 0% Solved -> 100 Difficulty
-    const value = Math.round(100 - solvedPct);
 
-    // Thresholds
+    // "Hardest" threshold is 99% solvability.
-    let level = 'easy';
+    // We calculate a base value first, then adjust for solvability.
-    if (value >= 90) level = 'extreme';     // < 10% Solved
-    else if (value >= 60) level = 'hardest'; // < 40% Solved
-    else if (value >= 30) level = 'harder';  // < 70% Solved
-    else level = 'easy';                     // > 70% Solved
     
-    return { level, value };
+    const densityFactor = 1 - 2 * Math.abs(density - 0.5);
+    const complexity = size * (0.4 + 0.6 * densityFactor);
+    
+    if (solvedPct < 99) {
+        // Requires guessing / advanced logic.
+        // Base penalty for low solvability: 85 to 100
+        const penaltyBase = 85 + ((99 - solvedPct) / 99) * 15;
+        
+        // Scale penalty by size. 
+        // Small grids (e.g. 5x5) are trivial even if "unsolvable" by simple logic.
+        // Large grids (e.g. 20x20) are truly extreme if unsolvable.
+        const sizeFactor = Math.min(1, size / 20);
+        
+        value = penaltyBase * sizeFactor;
+        
+        // Ensure difficulty doesn't drop below structural complexity
+        value = Math.max(value, complexity);
+    } else {
+        // Solvable (>= 99%)
+        // Complexity based on Size and Density
+        // Max size 80.
+        // Formula: size * (0.4 + 0.6 * densityFactor)
+        value = Math.min(85, complexity);
+    }
+        
+    if (value < 25) level = 'easy';
+    else if (value < 55) level = 'harder';
+    else if (value < 85) level = 'hardest';
+    else level = 'extreme';
+
+    return { level, value: Math.round(value) };
 }

src/utils/repro_solver.test.js

@@ -0,0 +1,49 @@
+
+import { describe, it, expect } from 'vitest';
+import { solvePuzzle } from './solver';
+import { calculateHints } from './puzzleUtils';
+
+describe('Solver Repro', () => {
+    it('should solve a simple generated puzzle', () => {
+        const grid = [
+            [1, 0, 1, 1, 0],
+            [1, 1, 0, 0, 1],
+            [0, 0, 1, 0, 0],
+            [1, 1, 1, 1, 1],
+            [0, 1, 0, 1, 0]
+        ];
+        const { rowHints, colHints } = calculateHints(grid);
+        
+        const result = solvePuzzle(rowHints, colHints);
+        expect(result.percentSolved).toBe(100);
+    });
+
+    it('should not fail on random valid lines', () => {
+        // Test solveLine indirectly via solvePuzzle on small grids
+        for (let i = 0; i < 100; i++) {
+            const size = 10;
+            const grid = [];
+            for(let r=0; r<size; r++) {
+                const row = [];
+                for(let c=0; c<size; c++) row.push(Math.random() > 0.5 ? 1 : 0);
+                grid.push(row);
+            }
+            
+            const { rowHints, colHints } = calculateHints(grid);
+            const result = solvePuzzle(rowHints, colHints);
+            
+            // It might not be 100% solvable without guessing (logic only), 
+            // but since our solver HAS backtracking, it MUST be 100% solvable 
+            // (unless timeout/max depth reached, but for 10x10 it should solve).
+            
+            // If it returns 0% or low %, it implies it failed to find the solution 
+            // or found a contradiction (which shouldn't happen for valid hints).
+            
+            if (result.percentSolved < 100) {
+                console.log('Failed Grid:', JSON.stringify(grid));
+                console.log('Result:', result);
+            }
+            expect(result.percentSolved).toBe(100);
+        }
+    });
+});

src/utils/shareUtils.js

@@ -4,7 +4,7 @@ export function buildShareCanvas(data, t, formattedTime) {
   const { grid, size, currentDensity, guideUsageCount } = data;
   if (!grid || !grid.length) return null;
   
-  const appUrl = 'https://nonograms.7u.pl/';
+  const appUrl = typeof __APP_HOMEPAGE__ !== 'undefined' ? __APP_HOMEPAGE__ : '';
   const maxBoard = 640;
   const cellSize = Math.max(8, Math.floor(maxBoard / size));
   const boardSize = cellSize * size;
@@ -119,7 +119,7 @@ export function buildShareSVG(data, t, formattedTime) {
   const { grid, size, currentDensity, guideUsageCount } = data;
   if (!grid || !grid.length) return null;
   
-  const appUrl = 'https://nonograms.7u.pl/';
+  const appUrl = typeof __APP_HOMEPAGE__ !== 'undefined' ? __APP_HOMEPAGE__ : '';
   const maxBoard = 640;
   const cellSize = Math.max(8, Math.floor(maxBoard / size));
   const boardSize = cellSize * size;
@@ -227,7 +227,11 @@ export function buildShareSVG(data, t, formattedTime) {
   }
 
   // URL
-  svgContent += `<text x="${padding}" y="${height - padding + 6}" font-family="Segoe UI, sans-serif" font-weight="500" font-size="14" fill="${urlColor}">${appUrl}</text>`;
+  svgContent += `
+    <a href="${appUrl}" target="_blank">
+      <text x="${padding}" y="${height - padding + 6}" font-family="Segoe UI, sans-serif" font-weight="500" font-size="14" fill="${urlColor}" style="text-decoration: underline; cursor: pointer;">${appUrl}</text>
+    </a>
+  `;
 
   svgContent += '</svg>';
   return svgContent;

src/utils/solver.js

@@ -6,6 +6,9 @@
  *  1: Filled
  */
 
+// Memoized helper for checking if hints fit
+const memo = new Map();
+
 /**
  * Solves a single line (row or column) based on hints and current knowledge.
  * Uses the "Left-Right Overlap" algorithm to find common filled cells.
@@ -15,10 +18,13 @@
  * @param {number[]} hints - Array of block lengths
  * @returns {number[]} - Updated line (or null if contradiction/impossible - though shouldn't happen for valid puzzles)
  */
-function solveLine(currentLine, hints) {
+export function solveLine(currentLine, hints) {
     const length = currentLine.length;
     
     // If no hints, all must be empty
+    // Clear memo for this line solve
+    memo.clear();
+
     if (hints.length === 0 || (hints.length === 1 && hints[0] === 0)) {
         return Array(length).fill(0);
     }
@@ -45,28 +51,23 @@ function solveLine(currentLine, hints) {
         while (currentIdx <= length - block) {
             if (canPlace(currentLine, currentIdx, block)) {
                 // Verify we can fit remaining blocks
-                // Simple heuristic: do we have enough space? 
-                // A full recursive check is better but slower. 
-                // For "Logical Solver" we assume valid placement is possible if we respect current constraints.
-                // However, strictly, we need to know if there is *any* valid arrangement starting here.
-                // Let's use a recursive check with memoization for "can fit rest".
                 if (canFitRest(currentLine, currentIdx + block + 1, hints, hIndex + 1)) {
                     leftPositions.push(currentIdx);
                     currentIdx += block + 1; // Move past this block + 1 space
                     break;
                 }
             }
+            // Cannot skip a filled cell - if we pass a '1', it becomes uncovered
+            if (currentLine[currentIdx] === 1) return null;
             currentIdx++;
         }
         if (leftPositions.length <= hIndex) return null; // Impossible
     }
 
-    // 2. Calculate Right-Most Positions (by reversing line and hints)
+    // Clear memo for right-side calculation (different line/hints)
-    // This is symmetrical to Left-Most.
+    memo.clear();
-    // Instead of implementing reverse logic, we can just reverse inputs, run left-most, and reverse back.
-    // But we need to respect the "currentLine" constraints which might be asymmetric.
 
-    // Actually, "Right-Most" is just "Left-Most" on the reversed grid.
+    // 2. Calculate Right-Most Positions (by reversing line and hints)
     const reversedLine = [...currentLine].reverse();
     const reversedHints = [...hints].reverse();
     const rightPositionsReversed = [];
@@ -82,14 +83,14 @@ function solveLine(currentLine, hints) {
                     break;
                 }
             }
+            // Cannot skip a filled cell
+            if (reversedLine[currentIdx] === 1) return null;
             currentIdx++;
         }
         if (rightPositionsReversed.length <= hIndex) return null;
     }
     
     // Convert reversed positions to actual indices
-    // index in reversed = length - 1 - (original_index + block_size - 1)
-    // original_start = length - 1 - (reversed_start + block_size - 1) = length - reversed_start - block_size
     const rightPositions = rightPositionsReversed.map((rStart, i) => {
         const block = reversedHints[i];
         return length - rStart - block;
@@ -106,13 +107,6 @@ function solveLine(currentLine, hints) {
         const block = hints[i];
         
         // If overlap exists: [r, l + block - 1]
-        // Example: Block 5. Left: 2, Right: 4.
-        // Left:  ..XXXXX...
-        // Right: ....XXXXX.
-        // Overlap:   ..XXX...
-        // Indices: max(l, r) to min(l+block, r+block) - 1 ?
-        // Range is [r, l + block - 1] (inclusive)
-        
         if (r < l + block) {
             for (let k = r; k < l + block; k++) {
                 newLine[k] = 1;
@@ -121,15 +115,6 @@ function solveLine(currentLine, hints) {
     }
 
     // Determine Empty cells?
-    // A cell is empty if it is not covered by ANY block in ANY valid configuration.
-    // This is harder with just L/R limits.
-    // However, we can use the "Simple Glue" logic:
-    // If a cell is outside the range [LeftLimit[i], RightLimit[i] + block] for ALL i, it's empty.
-    // Wait, indices are not strictly partitioned. Block 1 could be at 0 or 10.
-    // But logic dictates order.
-    // Range of block i is [LeftPositions[i], RightPositions[i] + hints[i]].
-    // If a cell k is not in ANY of these ranges, it is 0.
-    
     // Mask of possible filled cells
     const possibleFilled = Array(length).fill(false);
     for (let i = 0; i < hints.length; i++) {
@@ -148,8 +133,7 @@ function solveLine(currentLine, hints) {
 }
 
 // Memoized helper for checking if hints fit
-const memo = new Map();
+export function canFitRest(line, startIndex, hints, hintIndex) {
-function canFitRest(line, startIndex, hints, hintIndex) {
     // Optimization: If hints are empty, we just need to check if remaining line has no '1's
     if (hintIndex >= hints.length) {
         for (let i = startIndex; i < line.length; i++) {
@@ -158,23 +142,32 @@ function canFitRest(line, startIndex, hints, hintIndex) {
         return true;
     }
 
-    // Key for memoization (primitive approach)
+    // Memoization key
-    // In a full solver, we'd pass a cache. For single line, maybe overkill, but safe.
+    const key = `${startIndex}-${hintIndex}`;
-    // let key = `${startIndex}-${hintIndex}`; 
+    if (memo.has(key)) return memo.get(key);
-    // Skipping memo for now as line lengths are small (<80) and recursion depth is low.
 
     const remainingLen = line.length - startIndex;
     // Min space needed: sum of hints + (hints.length - 1) spaces
-    // Calculate lazily or precalc?
     let minSpace = 0;
     for(let i=hintIndex; i<hints.length; i++) minSpace += hints[i] + (i < hints.length - 1 ? 1 : 0);
     
-    if (remainingLen < minSpace) return false;
+    if (remainingLen < minSpace) {
+        memo.set(key, false);
+        return false;
+    }
 
     const block = hints[hintIndex];
     // Try to find *any* valid placement for this block
-    // We only need ONE valid path to return true.
+    for (let i = startIndex; i <= line.length - minSpace; i++) {
-    for (let i = startIndex; i <= line.length - minSpace; i++) { // Optimization on upper bound?
+         // If we skipped a '1', we went too far. All 1s must be covered by blocks.
+         // Since we are placing the *next* block, any 1s between startIndex and i are uncovered.
+         // Thus, if we find a 1 in [startIndex, i-1], we must stop.
+         let skippedOne = false;
+         for (let x = startIndex; x < i; x++) {
+             if (line[x] === 1) { skippedOne = true; break; }
+         }
+         if (skippedOne) break;
+
          // Check placement
          let valid = true;
          // Block
@@ -183,96 +176,276 @@ function canFitRest(line, startIndex, hints, hintIndex) {
          }
          if (!valid) continue;
          
-         // Boundary before (checked by loop start usually, but strictly:
+         // Boundary before
-         if (i > 0 && line[i-1] === 1) valid = false; // Should have been handled by caller or skip
+         if (i > 0 && line[i-1] === 1) valid = false; 
-         // Wait, the caller (loop) iterates i. 
-         // If i > startIndex, we implied space at i-1.
-         // If line[i-1] is 1, we can't place here if we skipped it.
-         // Actually, if we skip a '1', that's invalid.
-         // So we can't just skip '1's.
          
-         // Correct logic:
+         // Boundary after (check implicit in next block placement or end of line, but we need to check i+block cell)
-         // We iterate i. If we pass a '1' at index < i, that 1 is orphaned -> Invalid path.
-         // So we can only scan forward as long as we don't skip a '1'.
-         
-         let skippedOne = false;
-         for (let x = startIndex; x < i; x++) {
-             if (line[x] === 1) { skippedOne = true; break; }
-         }
-         if (skippedOne) break; // Cannot go further right, we left a 1 behind.
-         
-         // Boundary after
          if (i + block < line.length && line[i+block] === 1) valid = false;
          
          if (valid) {
              // Recurse
-             if (canFitRest(line, i + block + 1, hints, hintIndex + 1)) return true;
+             if (canFitRest(line, i + block + 1, hints, hintIndex + 1)) {
+                 memo.set(key, true);
+                 return true;
+             }
          }
     }
     
+    memo.set(key, false);
     return false;
 }
 
-
 /**
- * Solves the puzzle using logical iteration.
+ * Main solver function that attempts to solve the puzzle using logic and backtracking (DFS).
+ * Uses an efficient propagation queue and undo stack to avoid deep copying the grid.
+ * 
  * @param {number[][]} rowHints 
  * @param {number[][]} colHints 
- * @returns {object} { solvedGrid: number[][], percentSolved: number }
+ * @param {function} onProgress - Optional callback for progress reporting (percent)
+ * @param {number[][]} initialGrid - Optional initial grid state
+ * @param {boolean} logicOnly - If true, stops after logical propagation (no guessing)
+ * @returns {object} result
  */
-export function solvePuzzle(rowHints, colHints) {
+export function solvePuzzle(rowHints, colHints, onProgress, initialGrid = null, logicOnly = false) {
     const rows = rowHints.length;
     const cols = colHints.length;
+    const totalCells = rows * cols;
     
-    // Initialize grid with -1
+    // Grid initialization: -1 (Unknown), 0 (Empty), 1 (Filled)
-    let grid = Array(rows).fill(null).map(() => Array(cols).fill(-1));
+    // Use initialGrid if provided (deep copy to be safe)
+    const grid = initialGrid 
+        ? initialGrid.map(row => [...row]) 
+        : Array(rows).fill().map(() => Array(cols).fill(-1));
     
-    let changed = true;
+    // Stats
-    let iterations = 0;
+    let iterations = 0; // Total calls to solve()
-    const MAX_ITER = 100; // Safety break
+    let maxDepth = 0;   // Max recursion depth
+    let backtracks = 0; // Failed guesses
+    let logicSteps = 0; // Cells filled by propagation
+    let lastProgressTime = 0;
 
-    while (changed && iterations < MAX_ITER) {
+    function reportProgress() {
-        changed = false;
+        if (!onProgress) return;
-        iterations++;
+        const now = Date.now();
-        
+        if (now - lastProgressTime >= 50) {
-        // Rows
+            let filled = 0;
-        for (let r = 0; r < rows; r++) {
+            for(let r=0; r<rows; r++) {
-            const newLine = solveLine(grid[r], rowHints[r]);
+                for(let c=0; c<cols; c++) {
-            if (newLine) {
+                    if(grid[r][c] !== -1) filled++;
-                for (let c = 0; c < cols; c++) {
-                    if (grid[r][c] !== newLine[c]) {
-                        grid[r][c] = newLine[c];
-                        changed = true;
-                    }
-                }
-            }
-        }
-        
-        // Cols
-        for (let c = 0; c < cols; c++) {
-            const currentCol = grid.map(row => row[c]);
-            const newCol = solveLine(currentCol, colHints[c]);
-            if (newCol) {
-                for (let r = 0; r < rows; r++) {
-                    if (grid[r][c] !== newCol[r]) {
-                        grid[r][c] = newCol[r];
-                        changed = true;
-                    }
                 }
             }
+            onProgress(Math.floor((filled/totalCells) * 100));
+            lastProgressTime = now;
         }
     }
     
-    // Calculate solved %
+    // Queue for propagation (Set of strings "r{i}" or "c{i}")
+    const queue = new Set();
+    for(let r=0; r<rows; r++) queue.add(`r${r}`);
+    for(let c=0; c<cols; c++) queue.add(`c${c}`);
+
+    // Helper: Undo changes from a propagation step
+    function undo(changes) {
+        for(let i=changes.length-1; i>=0; i--) {
+            const {r, c, old} = changes[i];
+            grid[r][c] = old;
+        }
+    }
+
+    // Helper: Propagate logic constraints until fixed point or contradiction
+    // Returns list of changes made, or null if contradiction found
+    function propagate() {
+        const changes = [];
+        
+        try {
+            while(queue.size > 0) {
+                reportProgress();
+                
+                const item = queue.values().next().value;
+                queue.delete(item);
+                
+                const type = item[0];
+                const idx = parseInt(item.slice(1));
+                
+                let currentLine, hints;
+                if (type === 'r') {
+                    currentLine = grid[idx]; // Reference for row (fast)
+                    hints = rowHints[idx];
+                } else {
+                    currentLine = grid.map(row => row[idx]); // Copy for col (slower)
+                    hints = colHints[idx];
+                }
+                
+                const newLine = solveLine(currentLine, hints);
+                
+                if (!newLine) throw 'contradiction';
+                
+                // Apply changes
+                for(let i=0; i<newLine.length; i++) {
+                    if (currentLine[i] !== newLine[i]) {
+                        // If we try to change a known value to something else -> Contradiction
+                        if (currentLine[i] !== -1 && currentLine[i] !== newLine[i]) throw 'contradiction';
+                        
+                        if (currentLine[i] === -1) {
+                            const r = type === 'r' ? idx : i;
+                            const c = type === 'r' ? i : idx;
+                            
+                            // Double check if already set by orthogonal update in same loop?
+                            // (Should be handled by -1 check above, as grid is shared)
+                            if (grid[r][c] === -1) {
+                                grid[r][c] = newLine[i];
+                                changes.push({r, c, old: -1});
+                                logicSteps++;
+                                
+                                // Add orthogonal line to queue
+                                if (type === 'r') queue.add(`c${c}`);
+                                else queue.add(`r${r}`);
+                            } else if (grid[r][c] !== newLine[i]) {
+                                console.log('Contradiction: Orthogonal Conflict at', r, c, 'Grid:', grid[r][c], 'New:', newLine[i]);
+                                throw 'contradiction';
+                            }
+                        }
+                    }
+                }
+            }
+        } catch (e) {
+            // Revert changes from this failed propagation
+            undo(changes);
+            return null;
+        }
+        return changes;
+    }
+
+    // DFS Solver
+    function solve(depth) {
+        maxDepth = Math.max(maxDepth, depth);
+        iterations++;
+        
+        reportProgress();
+        
+        // 1. Propagate Logic
+        const changes = propagate();
+        if (!changes) return false; // Contradiction
+        
+        // 2. Find Best Branch Candidate
+        let bestR = -1, bestC = -1;
+        let minUnknowns = Infinity;
+        let isComplete = true;
+        
+        // Scan for unknowns and pick heuristic
+        // Heuristic: Line with fewest unknowns (most constrained)
+        for(let r=0; r<rows; r++) {
+            let unknowns = 0;
+            let firstUnknownC = -1;
+            for(let c=0; c<cols; c++) {
+                if(grid[r][c] === -1) {
+                    unknowns++;
+                    if (firstUnknownC === -1) firstUnknownC = c;
+                }
+            }
+            
+            if (unknowns > 0) {
+                isComplete = false;
+                if (unknowns < minUnknowns) {
+                    minUnknowns = unknowns;
+                    bestR = r;
+                    bestC = firstUnknownC;
+                }
+                if (minUnknowns === 1) break; // Optimal
+            }
+        }
+        
+        if (isComplete) return true; // Solved!
+        
+        // 3. Branching (Guessing)
+        // Try 1
+        grid[bestR][bestC] = 1;
+        queue.add(`r${bestR}`);
+        queue.add(`c${bestC}`);
+        
+        if (solve(depth + 1)) return true;
+        
+        // Backtrack from 1
+        grid[bestR][bestC] = -1; // Undo guess
+        // (Recursive call already undid its propagation changes)
+        
+        // Try 0
+        grid[bestR][bestC] = 0;
+        queue.add(`r${bestR}`);
+        queue.add(`c${bestC}`);
+        
+        if (solve(depth + 1)) return true;
+        
+        // Backtrack from 0
+        grid[bestR][bestC] = -1; // Undo guess
+        backtracks++;
+        
+        // Undo propagation from this level
+        undo(changes);
+        return false;
+    }
+    
+    // Start Solving
+    if (logicOnly) {
+        // Just logical propagation without guessing
+        if (initialGrid) {
+            // If resuming, ensure queue has all lines to check consistency
+            queue.clear();
+            for(let r=0; r<rows; r++) queue.add(`r${r}`);
+            for(let c=0; c<cols; c++) queue.add(`c${c}`);
+        }
+        
+        // Propagate logic constraints
+        propagate();
+        // No DFS, so iterations/backtracks remain 0
+    } else if (!initialGrid) {
+        // Normal start (full solver)
+        solve(0);
+    } else {
+        // Resume from provided state (full solver)
+        // We need to populate the queue with all rows/cols since we don't know what changed
+        queue.clear();
+        for(let r=0; r<rows; r++) queue.add(`r${r}`);
+        for(let c=0; c<cols; c++) queue.add(`c${c}`);
+        solve(0);
+    }
+    
+    // Calculate Percent Solved
     let solvedCount = 0;
-    for (let r = 0; r < rows; r++) {
+    grid.forEach(r => r.forEach(c => { if(c !== -1) solvedCount++; }));
-        for (let c = 0; c < cols; c++) {
+    let percentSolved = (solvedCount / totalCells) * 100;
-            if (grid[r][c] !== -1) solvedCount++;
+    
+    if (onProgress) onProgress(Math.floor(percentSolved));
+
+    // Difficulty Calculation
+    // Logic:
+    // - Base: 0-20% based on size/density
+    // - Logic: 0-30% based on iterations needed (depth 0)
+    // - Guessing: 0-50% based on backtracks/depth
+    
+    let difficultyScore = 0;
+    const effectiveSize = Math.sqrt(totalCells);
+    
+    if (percentSolved < 100) {
+        difficultyScore = 100; // Unsolvable (or timed out/too hard)
+    } else {
+        if (maxDepth === 0) {
+            // Pure logic
+            difficultyScore = Math.min(30, effectiveSize);
+        } else {
+            // Required guessing
+            // Simple heuristic: 30 + backtracks * 5 + depth * 2
+            difficultyScore = 30 + (backtracks * 2) + (maxDepth * 5);
+            difficultyScore = Math.min(100, difficultyScore);
         }
     }
     
     return { 
-        solvedGrid: grid,
+        percentSolved, 
-        percentSolved: (solvedCount / (rows * cols)) * 100
+        difficultyScore: Math.round(difficultyScore), 
+        lookaheadUsed: maxDepth > 0,
+        iterations,
+        maxDepth,
+        backtracks
     };
 }

src/utils/solver.test.js

@@ -0,0 +1,64 @@
+    it('solves a puzzle requiring guessing (Backtracking)', () => {
+        // A puzzle that logic alone cannot start usually has multiple solutions or requires a guess.
+        // Example: The "domino" or "ambiguous" pattern, but we need a unique solution that requires lookahead.
+        // Or just a very hard unique puzzle.
+        // A simple case where line logic is stuck but global constraints solve it.
+        // 
+        // 0 1 1 0
+        // 1 0 0 1
+        // 1 0 0 1
+        // 0 1 1 0
+        // Hints:
+        // R: 2, 1 1, 1 1, 2
+        // C: 2, 1 1, 1 1, 2
+        // This is a "ring". It might be solvable by logic if corners are forced.
+        // Let's try a known "hard" small pattern.
+        // 
+        // 0 0 0
+        // 0 1 0
+        // 0 0 0
+        // R: 0, 1, 0
+        // C: 0, 1, 0
+        // Logic solves this instantly.
+        
+        // Let's trust the logic works for general backtracking by forcing a guess.
+        // We can mock solveLine to return "no change" to force backtracking? No, integration test is better.
+        
+        // Let's just ensure it returns a valid result structure for a solvable puzzle.
+        const rowHints = [[1], [1], [1]];
+        const colHints = [[1], [1], [1]];
+        // 3x3 diagonal?
+        // 1 0 0
+        // 0 1 0
+        // 0 0 1
+        // Hints: 1, 1, 1
+        // Cols: 1, 1, 1
+        // This has multiple solutions (diagonal or anti-diagonal or others).
+        // Our solver should find ONE of them and return 100%.
+        
+        const result = solvePuzzle(rowHints, colHints);
+        expect(result.percentSolved).toBe(100);
+        // It might use lookahead because logic can't decide.
+        // Actually for this specific case, logic does nothing (all empty or all full are not possible, but many perms).
+        // So it MUST branch.
+        expect(result.maxDepth).toBeGreaterThan(0);
+    });
+
+    it('stress test: should solve 100 random valid 10x10 grids', () => {
+        // This ensures the solver is robust and doesn't fail on valid puzzles.
+        // Using a fixed seed or just running a loop.
+        for (let i = 0; i < 100; i++) {
+            const size = 10;
+            const grid = generateRandomGrid(size, 0.5);
+            const { rowHints, colHints } = calculateHints(grid);
+            
+            const result = solvePuzzle(rowHints, colHints);
+            
+            if (result.percentSolved < 100) {
+                console.error('Failed Grid:', JSON.stringify(grid));
+                console.error('Result:', result);
+            }
+            expect(result.percentSolved).toBe(100);
+        }
+    });
+});

src/utils/workerPool.js

@@ -0,0 +1,170 @@
+import SolverWorker from '../workers/solver.worker.js?worker';
+
+class WorkerPool {
+    constructor() {
+        this.workers = [];
+        this.queue = [];
+        this.active = 0;
+        this.poolSize = navigator.hardwareConcurrency || 4;
+        
+        for (let i = 0; i < this.poolSize; i++) {
+            const worker = new SolverWorker();
+            worker.onmessage = (e) => this.handleWorkerMessage(worker, e);
+            worker.onerror = (e) => this.handleWorkerError(worker, e);
+            this.workers.push({ worker, busy: false, id: i });
+        }
+    }
+
+    run(taskData, onProgress) {
+        return new Promise((resolve, reject) => {
+            const task = { data: taskData, resolve, reject, onProgress };
+            const freeWorker = this.workers.find(w => !w.busy);
+            
+            if (freeWorker) {
+                this.execute(freeWorker, task);
+            } else {
+                this.queue.push(task);
+            }
+        });
+    }
+
+    runRace(tasks) {
+        return new Promise((resolve, reject) => {
+            let activeCount = tasks.length;
+            let resolved = false;
+            
+            tasks.forEach(taskData => {
+                this.run(taskData.data, taskData.onProgress)
+                    .then(result => {
+                        if (resolved) return;
+                        
+                        // Heuristic: If solved 100%, we have a winner
+                        if (result.solvability === 100) {
+                            resolved = true;
+                            resolve(result);
+                            // Cancel others (optional but good for perf)
+                            // We can't easily cancel *specific* other tasks in this pool implementation without IDs
+                            // But since this is a "Race", we assume the caller will handle cleanup or we just let them finish
+                        } else {
+                            // If not fully solved, we wait for others?
+                            // Or maybe we collect all results and pick best?
+                            // For "Race", we usually want the first *Success*.
+                            // If all fail (finish without 100%), we reject or return best.
+                            activeCount--;
+                            if (activeCount === 0) {
+                                // All finished, none 100%. Return the last one (or logic to pick best)
+                                resolve(result); 
+                            }
+                        }
+                    })
+                    .catch(err => {
+                        if (resolved) return;
+                        activeCount--;
+                        if (activeCount === 0) {
+                            reject(new Error('All workers failed'));
+                        }
+                    });
+            });
+        });
+    }
+
+    execute(workerObj, task) {
+        workerObj.busy = true;
+        workerObj.currentTask = task;
+        this.active++;
+        workerObj.worker.postMessage(task.data);
+    }
+
+    handleWorkerMessage(worker, e) {
+        const workerObj = this.workers.find(w => w.worker === worker);
+        if (workerObj && workerObj.currentTask) {
+            if (e.data.type === 'progress') {
+                if (workerObj.currentTask.onProgress) {
+                    workerObj.currentTask.onProgress(e.data.percent);
+                }
+                return; // Don't resolve yet
+            }
+            
+            if (e.data.error) {
+                workerObj.currentTask.reject(new Error(e.data.error));
+            } else {
+                workerObj.currentTask.resolve(e.data);
+            }
+            
+            workerObj.currentTask = null;
+            workerObj.busy = false;
+            this.active--;
+            this.processQueue();
+        }
+    }
+
+    handleWorkerError(worker, e) {
+        const workerObj = this.workers.find(w => w.worker === worker);
+        if (workerObj && workerObj.currentTask) {
+            workerObj.currentTask.reject(e);
+            workerObj.currentTask = null;
+            workerObj.busy = false;
+            this.active--;
+            this.processQueue();
+        }
+    }
+
+    processQueue() {
+        if (this.queue.length > 0) {
+            const freeWorker = this.workers.find(w => !w.busy);
+            if (freeWorker) {
+                const task = this.queue.shift();
+                this.execute(freeWorker, task);
+            }
+        }
+    }
+
+    clearQueue() {
+        this.queue.forEach(task => {
+            task.reject(new Error('Cancelled'));
+        });
+        this.queue = [];
+    }
+
+    cancelAll() {
+        this.clearQueue();
+        
+        // Terminate and restart busy workers
+        this.workers.forEach((w, index) => {
+            if (w.busy) {
+                w.worker.terminate();
+                
+                if (w.currentTask) {
+                    w.currentTask.reject(new Error('Terminated'));
+                }
+
+                // Create replacement
+                const newWorker = new SolverWorker();
+                newWorker.onmessage = (e) => this.handleWorkerMessage(newWorker, e);
+                newWorker.onerror = (e) => this.handleWorkerError(newWorker, e);
+                
+                // Replace in array
+                this.workers[index] = { worker: newWorker, busy: false, id: w.id };
+            }
+        });
+        
+        // Reset active count since all busy workers were replaced with idle ones
+        this.active = 0;
+    }
+
+    terminate() {
+        this.workers.forEach(w => w.worker.terminate());
+        this.workers = [];
+        this.queue = [];
+    }
+}
+
+// Singleton instance
+let poolInstance = null;
+
+export const getWorkerPool = () => {
+    if (!poolInstance) {
+        poolInstance = new WorkerPool();
+    }
+    return poolInstance;
+};

src/workers/solver.worker.js

@@ -0,0 +1,62 @@
+import { calculateHints } from '../utils/puzzleUtils';
+import { solvePuzzle } from '../utils/solver';
+
+self.onmessage = (e) => {
+    const { id, grid, initialGrid } = e.data;
+    
+    try {
+        if (!grid || grid.length === 0) {
+            self.postMessage({ id, error: 'Empty grid' });
+            return;
+        }
+
+        const rows = grid.length;
+        const cols = grid[0].length;
+        // Use initialGrid if provided, otherwise assume we are starting fresh
+        // BUT wait, 'grid' passed here is usually the 0/1 grid from Image Import (target pattern).
+        // 'initialGrid' would be the partial solution state (-1/0/1).
+        
+        // 1. Calculate Hints from the TARGET grid (the image)
+        const { rowHints, colHints } = calculateHints(grid);
+
+        // 2. Run Solver (Logic + Lookahead)
+        const onProgress = (percent) => {
+            self.postMessage({
+                id,
+                type: 'progress',
+                percent
+            });
+        };
+
+        const { percentSolved, difficultyScore, lookaheadUsed } = solvePuzzle(rowHints, colHints, onProgress, initialGrid);
+
+        // 3. Determine Level
+        let value = difficultyScore;
+        let level;
+
+        if (percentSolved < 100) {
+            level = 'extreme'; // Unsolvable by logic+lookahead
+        } else {
+            if (value < 25) level = 'easy';
+            else if (value < 50) level = 'medium';
+            else if (value < 75) level = 'hard';
+            else level = 'extreme';
+        }
+        
+        // Add specific note if lookahead was needed?
+        // UI doesn't have a field for that, but we can encode it in difficultyLabel if needed.
+        // For now, standard levels are fine.
+
+        self.postMessage({
+            id,
+            solvability: Math.floor(percentSolved),
+            difficulty: Math.round(value),
+            difficultyLabel: level,
+            rows,
+            cols
+        });
+
+    } catch (err) {
+        self.postMessage({ id, error: err.message });
+    }
+};

src/workers/solverWorker.js

@@ -1,4 +1,5 @@
 import { calculateHints } from '../utils/puzzleUtils.js';
+import { solveLine } from '../utils/solver.js';
 
 const messages = {
   pl: {
@@ -40,195 +41,33 @@ const t = (locale, key, params) => {
   return typeof value === 'string' ? format(value, params) : key;
 };
 
-const buildPrefix = (lineState) => {
-  const n = lineState.length;
-  const filled = new Array(n + 1).fill(0);
-  const cross = new Array(n + 1).fill(0);
-  for (let i = 0; i < n; i++) {
-    filled[i + 1] = filled[i] + (lineState[i] === 1 ? 1 : 0);
-    cross[i + 1] = cross[i] + (lineState[i] === 2 ? 1 : 0);
-  }
-  return { filled, cross };
-};
-
-const buildSuffixMin = (hints) => {
-  const m = hints.length;
-  const suffixMin = new Array(m + 1).fill(0);
-  let sumHints = 0;
-  for (let i = m - 1; i >= 0; i--) {
-    sumHints += hints[i];
-    const separators = m - i - 1;
-    suffixMin[i] = sumHints + separators;
-  }
-  return suffixMin;
-};
-
 const solveLineLogic = (lineState, hints) => {
-  const n = lineState.length;
+  // Map Store format (0=Unk, 1=Fill, 2=Cross) to Solver format (-1=Unk, 1=Fill, 0=Empty)
-  const m = hints.length;
+  const solverLine = lineState.map(cell => {
-  if (m === 0) {
+    if (cell === 0) return -1; // Unknown
-    for (let i = 0; i < n; i++) {
+    if (cell === 1) return 1;  // Filled
-      if (lineState[i] === 0) return { index: i, state: 2 };
+    if (cell === 2) return 0;  // Empty/Cross
-    }
+    return -1;
-    return { index: -1 };
+  });
-  }
 
-  const { filled, cross } = buildPrefix(lineState);
+  // Call robust solver
-  const suffixMin = buildSuffixMin(hints);
+  const resultLine = solveLine(solverLine, hints);
 
-  const hasFilled = (a, b) => filled[b] - filled[a] > 0;
+  // Check for new info
-  const hasCross = (a, b) => cross[b] - cross[a] > 0;
+  if (!resultLine) return { index: -1 }; // Contradiction or error
 
-  const memoSuffix = Array.from({ length: n + 1 }, () => Array(m + 1).fill(null));
+  for (let i = 0; i < lineState.length; i++) {
-  const memoPrefix = Array.from({ length: n + 1 }, () => Array(m + 1).fill(null));
+    // We only care about cells that are currently 0 (Unknown) in Store
-
+    if (lineState[i] === 0) {
-  const canPlaceSuffix = (pos, hintIndex) => {
+      if (resultLine[i] === 1) {
-    const cached = memoSuffix[pos][hintIndex];
+        return { index: i, state: 1 }; // Suggest Fill
-    if (cached !== null) return cached;
-    if (hintIndex === m) {
-      const result = !hasFilled(pos, n);
-      memoSuffix[pos][hintIndex] = result;
-      return result;
-    }
-    const len = hints[hintIndex];
-    // maxStart logic: we need enough space for this block (len) + subsequent blocks/gaps (suffixMin[hintIndex+1])
-    // suffixMin[hintIndex] = len + (m - hintIndex - 1) + suffixMin[hintIndex+1]
-    // Actually suffixMin[hintIndex] already includes everything needed from here to end.
-    // So if we place block at start, end is start + len.
-    // Total space needed is suffixMin[hintIndex].
-    // So start can go up to n - suffixMin[hintIndex].
-    const maxStart = n - suffixMin[hintIndex];
-    
-    for (let start = pos; start <= maxStart; start++) {
-      if (hasFilled(pos, start)) continue; // Must be empty before this block
-      if (hasCross(start, start + len)) continue; // Block space must be free of crosses
-      
-      // If not the last block, we need a gap after
-      if (hintIndex < m - 1) {
-          if (start + len < n && lineState[start + len] === 1) continue; // Gap must not be filled
-          // We can assume gap is at start + len. Next block starts at least at start + len + 1
-          const nextPos = start + len + 1;
-          if (canPlaceSuffix(nextPos, hintIndex + 1)) {
-            memoSuffix[pos][hintIndex] = true;
-            return true;
-          }
-      } else {
-          // Last block
-          // Check if we can fill the rest with empty
-          if (hasFilled(start + len, n)) continue;
-          memoSuffix[pos][hintIndex] = true;
-          return true;
       }
-    }
+      if (resultLine[i] === 0) {
-    memoSuffix[pos][hintIndex] = false;
+        return { index: i, state: 2 }; // Suggest Cross
-    return false;
-  };
-
-  const canPlacePrefix = (pos, hintCount) => {
-    const cached = memoPrefix[pos][hintCount];
-    if (cached !== null) return cached;
-    if (hintCount === 0) {
-      const result = !hasFilled(0, pos);
-      memoPrefix[pos][hintCount] = result;
-      return result;
-    }
-    const len = hints[hintCount - 1];
-    
-    // Logic for prefix:
-    // We are placing the (hintCount-1)-th block ending at 'start + len' <= pos.
-    // So 'start' <= pos - len.
-    // But we also need to ensure there is space for previous blocks.
-    // However, the simple constraint is just iterating backwards.
-    
-    // maxStart: if this is the only block, maxStart = pos - len.
-    // If there are previous blocks, we need a gap before this block.
-    // So previous block ended at start - 1.
-    // Actually the recursive call will handle space check.
-    // But for the gap check:
-    // If we place block at 'start', we need lineState[start-1] != 1 (if start > 0).
-    // And we recursively check canPlacePrefix(start-1, count-1).
-    // But if start=0 and count > 1, impossible.
-    
-    const maxStart = pos - len; // Simplified, loop condition handles rest
-    
-    for (let start = maxStart; start >= 0; start--) {
-      if (hasCross(start, start + len)) continue;
-      if (hasFilled(start + len, pos)) continue; // Must be empty after this block up to pos
-      
-      // Check gap before
-      if (hintCount > 1) {
-          if (start === 0) continue; // No space for previous blocks
-          if (lineState[start - 1] === 1) continue; // Gap must not be filled
-          const prevPos = start - 1;
-          if (canPlacePrefix(prevPos, hintCount - 1)) {
-            memoPrefix[pos][hintCount] = true;
-            return true;
-          }
-      } else {
-          // First block
-          if (hasFilled(0, start)) continue; // Before first block must be empty
-          memoPrefix[pos][hintCount] = true;
-          return true;
-      }
-    }
-    memoPrefix[pos][hintCount] = false;
-    return false;
-  };
-
-  const possibleStarts = [];
-  for (let i = 0; i < m; i++) {
-    const len = hints[i];
-    const starts = [];
-    for (let start = 0; start <= n - len; start++) {
-      if (i === 0) {
-        if (!canPlacePrefix(start, 0)) continue;
-      } else {
-        if (start === 0) continue;
-        if (lineState[start - 1] === 1) continue;
-        if (!canPlacePrefix(start - 1, i)) continue;
-      }
-
-      if (hasCross(start, start + len)) continue;
-      if (start + len < n && lineState[start + len] === 1) continue;
-      const nextPos = start + len < n ? start + len + 1 : start + len;
-      if (!canPlaceSuffix(nextPos, i + 1)) continue;
-      starts.push(start);
-    }
-    possibleStarts.push(starts);
-  }
-
-  const mustFill = new Array(n).fill(false);
-  const coverage = new Array(n).fill(false);
-
-  for (let i = 0; i < m; i++) {
-    const starts = possibleStarts[i];
-    const len = hints[i];
-    if (starts.length === 0) return { index: -1 };
-    let earliest = starts[0];
-    let latest = starts[0];
-    for (let j = 1; j < starts.length; j++) {
-      earliest = Math.min(earliest, starts[j]);
-      latest = Math.max(latest, starts[j]);
-    }
-    const startOverlap = Math.max(earliest, latest);
-    const endOverlap = Math.min(earliest + len - 1, latest + len - 1);
-    for (let k = startOverlap; k <= endOverlap; k++) {
-      if (k >= 0 && k < n) mustFill[k] = true;
-    }
-    for (let s = 0; s < starts.length; s++) {
-      const start = starts[s];
-      for (let k = start; k < start + len; k++) {
-        coverage[k] = true;
       }
     }
   }
 
-  for (let i = 0; i < n; i++) {
-    if (lineState[i] === 0 && mustFill[i]) return { index: i, state: 1 };
-  }
-  for (let i = 0; i < n; i++) {
-    if (lineState[i] === 0 && !coverage[i]) return { index: i, state: 2 };
-  }
   return { index: -1 };
 };
 

vite.config.js

@@ -5,7 +5,8 @@ import path from 'path'
 
 export default defineConfig({
   define: {
-    '__APP_VERSION__': JSON.stringify(process.env.npm_package_version)
+    '__APP_VERSION__': JSON.stringify(process.env.npm_package_version),
+    '__APP_HOMEPAGE__': JSON.stringify(process.env.npm_package_homepage)
   },
   plugins: [
     vue(),
@@ -30,14 +31,14 @@ export default defineConfig({
         theme_color: '#00f2fe',
         icons: [
           {
-            src: '/pwa-192x192.svg',
+            src: '/pwa-192x192.png',
             sizes: '192x192',
-            type: 'image/svg+xml'
+            type: 'image/png'
           },
           {
-            src: '/pwa-512x512.svg',
+            src: '/pwa-512x512.png',
             sizes: '512x512',
-            type: 'image/svg+xml'
+            type: 'image/png'
           }
         ]
       }
@@ -47,5 +48,8 @@ export default defineConfig({
     alias: {
       '@': path.resolve(__dirname, './src')
     }
+  },
+  server: {
+    allowedHosts: true
   }
 })